# COMPASS Numerical Skills/Pre-Algebra Preparation Guide. Introduction Operations with Integers Absolute Value of Numbers 13

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1 COMPASS Numerical Skills/Pre-Algebra Preparation Guide Please note that the guide is for reference only and that it does not represent an exact match with the assessment content. The Assessment Centre at George Brown College is not responsible for students assessment results. TABLE OF CONTENTS Page # Introduction 3 1. Number Theory: - Classification of Numbers - Divisibility of Numbers - Prime Numbers and Prime Factorization - Multiples and Factors 4 2. Operations with Integers 9 3. Absolute Value of Numbers Operations with Fractions Operations with Decimals Conversions between Fractions, Decimals and Percent Percent Ratio and Proportion Exponents Scientific Notation Square Roots Measures of Central Tendency: Mean, Median, Mode 53 Page 1

2 13. Basic Geometry 54 Appendix A: Glossary 57 Appendix B: Multiplication Table 61 Appendix C: Rounding Numbers 62 Appendix D: Answers to Practice Questions 64 Page 2

3 Introduction The Compass Numerical Skills/Pre-Algebra - Preparation Guide is a reference tool for George Brown College students preparing to take the Compass Numerical Skills/Pre-Algebra assessment. The study guide focuses on foundation-level math skills. The study guide does not cover all topics on the assessment. The Compass Numerical Skills/Pre-Algebra - Preparation Guide is organized around a select number of arithmetic and pre-algebra topics. It is recommended that users follow the guide in a step-by-step order as one topic builds on the previous one. Each section contains theory, examples with full solutions and practice question(s). Answers to practice questions can be found in Appendix D. Reading comprehension and understanding of terminology are an important part of learning mathematics. Appendix A has a glossary of mathematical terms used throughout the Study Guide. Page 3

4 1. Number Theory Classification of Numbers Numbers can be classified into different sets as follows: Natural numbers the numbers we use to count. [1, 2, 3, 4, 5, ] Whole numbers - 0 and the numbers we use to count. [0, 1, 2, 3, 4, 5, ] Integers positive and negative whole numbers and 0. [ - 3, -2, -1, 0, 1, 2, 3, ] Rational any number that can be written in the form a where a is not a multiple of b and b b 0. Rational numbers include integers, fractions and some decimals. Irrational numbers that can NOT be represented as a fraction, a. (For example, π, e, b 3, 6 2) Real any number that can be represented on a number line; the union of rational and irrational numbers. Integers are further classified as a set of even numbers [ -6, -4, -2, 0, 2, 4, 6 ] OR odd numbers [ -5, -3, -1, 1, 3, 5, 7 ]. In general, a number is even if it can be written in the form 2n, where n is an integer; a number is odd if it can be written in the form 2n + 1. Practice question: 1. The number 19.2 is part of which of the following number sets? a) whole b) integer c) rational d) irrational Divisibility A number is divisible by another number if it divides evenly without a remainder. For example, 8 is divisible by 4 since 8 4 = 2 R0 (remainder 0). More formally, for integers a and b, we say that a divides b if and only if there exists an integer q such that aq = b. Here, a is a divisor of b and b is a multiple of a. Page 4

5 The following divisibility rules apply to whole numbers. Divisor Divisibility Rule Example Non - Example 2 Any whole number that ends in 0, 2, 4, 6, or 8 is divisible by 2. (i.e. Any even number is divisible by 2). 3 If the sum of the digits is divisible by 3, than the whole number is also divisible by 3. 4 If the last two digits of the whole number form a two-digit number that is divisible by 4, than the whole number is also divisible by 4. 5 Any whole number that ends in 0 or 5 is divisible by 5. 6 If a whole number is divisible by 2 AND 3, than it is divisible by 6. 8 If the last three digits of the whole number form a three-digit number that is divisible by 8, than the whole number is also divisible by 8. 9 If the sum of the digits is divisible by 9, than the whole number is also divisible by Any whole number that ends in 0 is divisible by is divisible by 2 since the last digit is is divisible by 3 since = 18 and 18 is divisible by is divisible by 4 since the last two digits, 36, form a number that is divisible by is divisible by 5 since the number ends in is divisible by 6 since this number is divisible by 2 (it ends in 2) and by 3 ( =15 and 15 is divisible by 3) is divisible by 8 since the last three digits, 160, form a number that is divisible by 8 (160 8 = 20) is divisible by 9 since =27 and 27 is divisible by 9 (27 9 = 3) is divisible by 10 since it ends in is not divisible by since the last digit is is not divisible by 3 since = 10 and 10 is not divisible by is not divisible by 4 since the last two digits, 37, form a number that is not divisible by is not divisible by 5 since the number ends in is not divisible by 6 since the number is divisible by 2 (it ends in 0) but not by 3 ( =14 and 14 is not divisible by 3) is not divisible by 8 since the last three digits, 161, form a number that is not divisible by is not divisible by 9 since =25 and 25 is not divisible by is not divisible by 10 since it ends in 5. Page 5

6 Some useful theorems: 1. Let a, b and c be integers. If b is divisible by a and c is divisible by b, then c is divisible by a. Example, a = 4, b = 16 and c = is divisible by is divisible by 16. Thus, 32 is divisible by Let a, b and c be integers. If b is divisible by a, then bc is also divisible by a. Example, a = 4, b = 16 and c = is divisible by 4. And 512 (=32 x 16) is also divisible by Let a, b and c be integers. If b is divisible by a and c is divisible by a, then b + c is divisible by a. Example, a = 4, b = 16 and c = is divisible by is divisible by 4. Thus, = 48 is divisible by Let a, b and c be integers. If b is divisible by a and c is divisible by a, then b c is divisible by a. Example, a = 4, b = 16 and c = is divisible by is divisible by = 16 is also divisible by 4. Practice question: 2. The number 360 is divisible by which of the following numbers? a) 10 b) 3 c) 5 d) 4 e) all of the above Prime Numbers & Prime Factorization A prime number is any natural number whose factors are 1 and itself (e.g. 2, 3, 5, 7, 11, 13, etc.). There are infinite number of primes. Note that 1 is not a prime number. Page 6

7 Numbers that are not prime numbers are called composite numbers. Composite numbers can be broken down into a product of prime numbers. This process is called prime factorization. The prime factorization of composite numbers is usually written as a product of powers of prime factors. The prime factorization of 24 is 2 3 x 3. Factor trees are a useful tool for figuring out all of the prime factors of a composite number (see figure below). Steps: - break the given number into the product of any two factors. - if possible, break down each of the new factors into its own factors. - repeat until you are left with only prime factors. - write repeating prime factors as a power (for example, 2 x 2 x 2 = 2 3 ) Practice question: 3. What is the prime factorization of 360? 4. Which of the following is NOT a prime factor of 126? a) 2 b) 1 c) 7 d) 9 e) b and d Multiples and Factors A multiple of a number is the product of that number and any whole number. (For example, multiples of 3 are 3, 6, 9, 12, 15, 18, ) A factor of a number is a number that will divide into another number exactly. (For example, factors of 6 are 1, 2, 3, and 6) Page 7

8 The greatest common factor (GCF) of two or more numbers is the biggest number that divides evenly (i.e. with no remainder) into each of the given numbers. Find the GCF of 12 and 18. Factors of 12 are 2 and 6, 3 and 4, 1 and 12. Factors of 18 are 1 and 18, 2 and 9, 3 and 6. The common factors are 1, 2, 3 and 6. The GCF is 6. The lowest common multiple (LCM) of two or more numbers is the smallest number that is a multiple of all the given numbers. Find the LCM of 12 and 18. Multiples of 12 are 24, 36, 48, 50, Multiples of 18 are 36, 54, 72, The LCM is 36. Practice questions: 5. What is the greatest common factor of 132 and 84? a) 2 b) 3 c) 12 d) What is the least common multiple of 10 and 12? a) 60 b) 36 c) 120 d) 80 Page 8

9 2. Operations with Integers Integers refer to a set of numbers which is made up of positive whole numbers, zero and negative whole numbers. Integers do NOT include decimals or fractions. Addition: Addition of integers can be illustrated on a number line. Every integer has a position on a number line in relation to 0 and other integers. By convention, positive integers are written to the right of 0 and negative integers are written to the left of 0. Every space represents 1 on the number line below. Find the sum of 3 and 5. Start at 3 and go 5 spaces to the right. The answer is 2. Practice question: 7. Use a number line to find the sum of 8 and 12. Drawing a number line can be time-consuming. The following shortcut rules may be used to add integers without a number line. To add two integers with different signs, find the difference of the two numbers. The result has the sign of the bigger number. To add two integers with same signs, find the sum of the two numbers. The result has the same sign as the two integers. Note: By convention, an integer with no sign in front of it is positive. Page 9

10 Example 1: Find the sum of 5 and =? 5 is negative and 8 is positive. The integers have different signs; thus, find the difference of the two numbers. The difference between 8 and 5 is 3. Take the sign of +8 since 8 is bigger than = 3 Example 2: Find the sum of 9 and ( 13) =? 9 and 13 are both negative. The integers have the same sign; thus, we find the sum of 9 and 13 which is 22. Keep the sign as negative. 9 + ( 13) = 22 Practice questions: 8. Find the sum of 15 and Find the sum of 8 and 15. Subtraction: To subtract two integers, change the question from subtraction to addition by adding the opposite of the given number. Opposite refers to an integer with the opposite sign. Negative and positive are opposite signs. Examples: 1. a) Evaluate = 21 + ( 34) [ 34 is the opposite of 34] = 45 b) Evaluate. 9 ( 45) 9 ( 45) = 9 + (45) [45 is the opposite of 45] = 54 Practice question: Page 10

11 10. Evaluate. 21 ( 4) 11. Evaluate Multiplication and Division To multiply or divide two integers, perform the multiplication or division as you would with whole numbers. Add the correct sign to the answer according to the rules below. (+)(+) = + (+) (+) = + (+)( ) = ( )(+) = (+) ( ) = ( ) (+)= ( )( ) = + ( ) ( )= + One way to remember these rules is that same signs result in a positive and different signs result in a negative. Examples: 1. a) ( 3)(15) = 45 b) 21 ( 7) = 3 c) ( 12)( 4) = 48 d) 45 ( 9) = 5 Practice Questions: 12. Evaluate. ( 12)( 11) = 13. Evaluate. 135 ( 5) = 14. Evaluate. ( 8)(3) + ( 25) a) 1 b) 1 c) 49 d) 49 Page 11

12 15. Evaluate ( 6)(2) a) 8 b) 8 c) 4 d) 20 Order of Operations As a general rule of thumb, the acronym BEDMAS can be followed for the correct order of operations. Brackets Exponents Division Multiplication Addition Subtraction Do in order from left to right. Do in order from left to right. Do in order from left to right. Important notes: - If there are multiple exponents, evaluate the powers from left to right as they appear in the question. - If there are multiple brackets, it does not matter which ones you do first, second, etc. - If there are multiple operations within brackets, do the operations according to BEDMAS. - Division and multiplication is done from left to right. This means that multiplication should be done before division, if it appears to the left of division. - Addition and subtraction is done from left to right. Subtraction should be done first, if it is to the left of addition. - For rational expressions, the numerator and denominator are evaluated separately according to BEDMAS. Then, determine the quotient. Examples: Evaluate. a) 9 + (10 8) 2 2 x 3 Step 1: Do the operation inside the brackets. = 9 + (2) 2 2 x 3 Step 2: Evaluate the exponent. Page 12

13 = x 3 Step 3: Do the division since it appears first going from left to right. = x 3 Step 4: Do the multiplication. = Step 5: Do the addition. = 15 Final answer is 15. b) Step 1: Evaluate the exponent on the top. Do the multiplication on 9(3) 12 the bottom. = Step 2: Do the division on the top = Step 3: Do the addition on the top. Do the subtraction on the bottom. = This is the final answer. The fraction cannot be reduced. Practice Question: 16. Evaluate x (9 2) 2 a) 115 b) 248 c) 56 d) Absolute Value of Numbers The absolute value of a number is the magnitude of the number. It can be thought of as the distance on a number line from the location of a number to 0. The absolute value of any number is always positive. For example, 3 = 3 and 3 = 3 since both 3 and 3 are located three units from Note that 0 = 0. Page 13

14 When there are multiple operations inside an absolute value, perform those operations first. Lastly, take the absolute value by making the number inside the bars positive. Evaluate 12( 5 + 2) 3 = 12( 3) 3 = 36 3 = 12 = 12 Practice Question: 17. Evaluate 4 + 8( 7) + 11 a) 49 b) 63 c) 41 d) Operations with Fractions A fraction is a number that represents parts of a whole. The numerator represents the number of parts you have. The denominator is the number of parts into which one whole is divided. Numerator Denominator 5 7 You have 5 parts One whole is divided into 7 parts An improper fraction is a fraction whose numerator is bigger than the denominator (e.g. 5, 9 ). 3 2 This means that an improper fraction is greater than one whole. A mixed number consists of a whole number and a fraction. (e.g. 2 7 ). 8 A mixed number can be written as an improper fraction and vice versa. Converting a Mixed Number to an Improper Fraction To convert a mixed number to an improper fraction: - Multiply the whole number by the denominator and add to the numerator*. - Keep the denominator the same**. Page 14

15 *This tells us how many parts we have in total (the parts that make up the whole number(s) and those in the numerator). **We keep the denominator the same because we have NOT changed the number of parts one whole is divided into. Convert 2 7 to an improper fraction. 8 Multiply whole number (2) by the denominator (8). Add the numerator (7) = 2(8)+7 8 = 23 8 Practice Question: Keep the denominator (8) the same 18. Which of the following fractions is equivalent to 5 7 9? a) b) 12 9 c) d) 52 9 Converting an Improper Fraction to a Mixed Number To convert an improper fraction to a mixed number: - Divide the numerator by the denominator. The answer should be a whole number and a remainder. - The whole number is the whole number part of the mixed number. - The remainder is the numerator of the fractional part of the mixed number. - Keep the denominator the same. Convert 9 into a mixed number. 2 Page 15

16 2 goes into 9 four times evenly. Thus, our mixed number will have 4 wholes and whatever fraction part is left over. 4 can be written as = Thus, Practice we have question: 1 left over as the 2 fractional part of the mixed number. 9 2 = What is 36 7 written as a mixed number? a) 1 7 b) c) d) Equivalent Fractions Two fractions are considered equivalent if they are equal in value. To determine if two given fractions are equivalent, find the lowest terms of each fraction. If the lowest terms are the same, then the fractions are equivalent. To find the lowest terms of a fraction, divide both the numerator and denominator by their greatest common factor. 1 2 is equivalent to 2 4. In the diagram below, you can see that 1 and 2 are equal in value. The large rectangle represents 2 4 one whole. The first rectangle is divided into two equal parts (denominator = 2) and one part is coloured (numerator = 1). The second rectangle is divided into four equal parts (denominator = 4) and two parts are coloured (numerator = 2). The coloured parts occupy the same area in both diagrams because the fractions are equal in value. However, 1 2 is NOT equivalent to 2 3. Page 16

17 As you can see in the diagram above, 2 occupies more space than 1. This is because 2 is bigger than 1 and the two fractions are NOT equivalent (i.e. not equal in value). 2 Also, notice that 2 can be reduced to 1 by dividing both the numerator and denominator of 2 by On the contrary, 2 can NOT be reduced to = Therefore, 2 4 = 1 2 But Note: For any fraction, there is an infinite number of equivalent fractions. Given a fraction, an equivalent fraction can be obtained by multiplying both the numerator and denominator by the same number. Write two fractions that are equivalent to = = Therefore, 6 15 and 8 20 are equivalent to 2 5. Note that both 6 15 and 8 20 can be reduced to 2 5. Practice question: 20. Which of the following fractions are equivalent to 7? 9 a) b) c) d) none of the above Page 17

18 Addition of Fractions To add two fractions, they MUST have the same (common) denominator. Usually, it is best to find the lowest common denominator. The lowest common denominator is equal to the lowest common multiple of the two denominators. If one of the denominators is a multiple of another, than the lowest common multiple is the bigger denominator. Once you have a common denominator, change each fraction to an equivalent fraction with the desired denominator. Lastly, add the numerators of the fractions and keep the denominator the same. Reduce the fraction to lowest terms and/or change an improper fraction to a mixed number, if necessary. Examples: 1) What is the sum of 2 3 and 5 6? = Step 1: Since the denominators of the fractions are different, we first need to find the lowest common denominator. In this case, the lowest common denominator is 6, since 6 is a multiple of 3. 2 = 2 2 = = = = 9 3 = = Step 2: 2 needs to be changed into an equivalent fraction with a 3 denominator of 6. To do this, multiply the numerator, 2, and denominator, 3, by 2.The fraction, 5, can stay as is, since it already 6 has a denominator of 6. Step 3: Add the numerators. Keep the denominator the same. Step 4: 9 can be reduced to 3 by dividing both the numerator and 6 2 denominator by 3. Step 5: 3 is an improper fraction and should be changed into a 2 mixed number. 2) =? Page 18

19 First find the lowest common denominator. We are looking for the lowest common multiple of 5 and 9. Note: If you are having trouble finding the lowest common multiple of two or more numbers, list the multiples for each number in a list. Look for the lowest multiple that appears in your lists. Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65,. Multiples of 9: 9, 18, 27, 36, 45, 54, 63, 72, The lowest common multiple of 5 and 9 is 45. In order to make 3 into an equivalent fraction with a denominator of 45, multiply both the 5 numerator and the denominator by 9. 3 = 3 (9) = (9) 45 In order to make 7 into an equivalent fraction with a denominator of 45, multiply both the 9 numerator and the denominator by 5. 7 = 7 (5) = (5) = = ) =? Find the lowest common denominator. We are looking for the lowest common multiple of 16 and 12. Multiples of 16: 16, 32, 48, 64, 80, 96,. Multiples of 12: 12, 24, 36, 48, 60, 72, The lowest common multiple of 16 and 12 is 48. In order to make 3 into an equivalent fraction with a denominator of 48, multiply both the 16 numerator and the denominator by 3. 3 = 3 (3) = (3) 48 Page 19

20 In order to make 7 into an equivalent fraction with a denominator of 48, multiply both the 12 numerator and the denominator by 4. 7 = 7 (4) = (4) = cannot be reduced. Therefore, the sum is Practice questions: 21. What is the sum of 2 5 a) b) c) d) and 1 15? 22. What is the sum of 1 7 and 3 5? a) b) 1 c) 26 d) Subtraction of Fractions To subtract two fractions, they MUST have the same (common) denominator (this is the same as adding fractions). Once you have a common denominator, change each fraction to an equivalent fraction with the desired denominator. Lastly, subtract the numerators of the fractions and keep the denominator the same. In subtraction, the order matters! Keep it the order the same in how the question is written. Reduce the fraction to lowest terms and/or change an improper fraction to a mixed number if necessary. Page 20

21 What is the difference between and 7 50? First, we need to find a common denominator for the two fractions. The lowest common multiple of 20 and 50 is (5) = (5) (2) = (2) 100 Now, subtract the numerators and keep the denominator the same = cannot be reduced. The final answer is Practice question: 23. What is the difference between and 2 9? a) b) 1 7 c) d) 63 Multiplication of Fractions To multiply fractions: - Multiply the numerator by the numerator - Multiply the denominator by the denominator - Reduce and/or change to a mixed number, if you can. Note: a common denominator is NOT needed! If multiplying a mixed number by a fraction OR two mixed numbers, first change the mixed number(s) to improper fraction(s) and then follow the same steps as above. Page 21

22 Examples: 1) What is the product of and 7 5? First, multiply the numerator by the numerator and denominator by the denominator. 13 x = 13 (7) 15 (5) = The product is an improper fraction. Change it to a mixed number. 91 = Final answer is ) What is the product of x 4 9? First, multiply the numerator by the numerator and denominator by the denominator. 19 (4) = (9) 180 Now, reduce the product. 76 and 180 are both divisible by = Note: It is also possible to reduce our fractions BEFORE we do the multiplication. This can be advantageous because the reducing happens with smaller numbers. In our multiplication above, we can reduce 4 on the top and 20 on the bottom by dividing both numbers by 4. We can reduce a numerator from one fraction and denominator from another because order does not matter when multiplying numbers (i.e. 19 x 4 or 4 x 19 gives the same answer). 4 = 1 19 (4) 20 (9) 4 = 5 = 19 (1) 5 (9) = ) What is the product of and 3 5? Our first step is to change 2 1 into an improper fraction = 19 9 Page 22

23 Now, we can multiply numerator by the numerator and denominator by the denominator. We can also reduce before performing the actual multiplication (3 and 9 are both divisible by 3). 19 x = 1 = 19 (3) 9 (5) = 19(1) 3(5) = = 3 Since our product is an improper fraction, we need to change it to a mixed number = The final answer is Practice questions: 24. What is the product of 4 19 and 5 2? a) b) c) d) What is the product of 17 1 and 5 22? 3 a) b) c) d) Division of fractions In order to divide two fractions: - Change the division problem to a multiplication problem by multiplying by the reciprocal of the divisor. (To find the reciprocal of a fraction, switch the numerator and denominator). - Multiply the fractions (see above). Page 23

24 If dividing a mixed number by a fraction OR two mixed numbers, first change the mixed number(s) to improper fraction(s) and then follow the same steps as above. Examples: 1) What is the quotient of and 1 5? In order to divide 19 and 1 19, we need to multiply by the reciprocal of The reciprocal of 1 5 is = 19 x x = 4 5 = 1 19 (1) = = 19 4(1) 4 The quotient is an improper fraction so we need to change it to a mixed number. 19 = Final answer is ) What is the quotient of and 9 11? First, we need to change 3 6 into an improper fraction = 27 7 Now, we divide 27 7 and = 27 x by multiplying by the reciprocal of = 3 27 x 11 = 3(11) = (1) 7 9 = 1 Page 24

25 Last step is to change = 45 7 Practice questions: to a mixed number. 26. What is the quotient of 5 4 and? a) 15 b) c) d) Both a and c 27. What is the quotient of 73 and 90 33? 5 73 a) 324 b) c) d) Ordering Fractions There are a numbers of ways to compare (greater than, less than, equal to) or order fractions. One way is to convert all fractions to equivalent fractions with a common denominator and then to compare the numerators. Given the same denominator, a fraction with a bigger numerator will be greater than a fraction with a smaller numerator. Another approach is to convert all fractions to decimals and then use the decimals to compare or order the given fractions. (See section on converting fractions to decimals.) Order the following numbers from least to greatest. 2 ; 5 ; 7 ; 2; Method 1: Using a common denominator Page 25

26 The lowest common multiple of 3, 6, 12, 1 and 2 is 12. Thus, the lowest common denominator for the fractions is = = = 2 1 = = 3 2 = < 8 < 10 < 18 < Therefore, 7 12 < 2 3 < 5 6 < 11 2 < 2 Method 2: Converting fractions to decimals 2 3 = = = = < < < 1.5 < 2 Therefore, 7 12 < 2 3 < 5 6 < 11 2 < 2 Practice Question: 28. Which of the following numbers are greater than 7 15? i) 1 2 ii) 1 3 iii) iv) 9 10 a) i and ii b) i, ii and iii c) ii and iv d) i, iii and iv Page 26

27 4. Operations with Decimals Addition (by hand) To add two decimals by hand, first line up the decimals according to place values. The decimal points should be lined up one on top of another. Perform the addition one column at a time starting at the right. The number in the tens place value of any two-digit numbers must be regrouped with the next column. The decimal point in the answer goes directly underneath the decimal points in the numbers being added. This is why it is so important to line up the decimals correctly! Make sure to line up the place values according to the decimal point. The decimal point will go in the SAME position in your answer If you wish, you may write 0 to fill in the empty place value = 10 Write 0. Regroup 1 to the left = 10 Write 0. Regroup 1 to the left = = 13 Write 3. Regroup 1 to the left = 14 Write 4. Regroup 1 to the left. Page 27

28 Practice questions: 29. Add Add Subtraction (by hand) To subtract two decimals by hand, first line up the decimals according to place values. The decimal points should be lined up one on top of another. Perform the subtraction one column at a time starting at the right. If the number on the top is smaller than the number on the bottom, you can regroup 1 from the number in the next column to the left and add 10 to your smaller number. The decimal point in the answer goes directly beneath the decimal points in the numbers being subtracted. Any empty decimal place values can be filled in with 0 s Make sure to line up the place values according to the decimal point. The decimal point will go in the SAME position in your answer Step 1: Write 0 in the empty place values. Step 5: 6 7 gives a negative answer. Thus, regroup 1 from the next column to the left. 0 is left in this column = 9 Write 9 directly below. Step 4: 8 8 = 0 Write 0 directly below Step 3: 9 0 = 9 Write 9 directly below. Step 2: 0 minus 4 gives a negative answer. Thus, regroup 1 from the next column to the left. There is a 0 in the next column. Thus, regroup 1 from the next column, which has 9. 1 is regrouped with the rightmost 0 to make ten. 8 and 9 is left in the next two columns to the left = 6 Write 6 directly below 0 and 4. Page 28

29 Practice questions: 31. Subtract Subtract Multiplication (by hand) To multiply two decimals by hand, first line up the numbers according to the last column. Ignore the decimal points for now. Next, follow the same procedure as multiplying whole numbers. Lastly, count the total number of decimal places between the two decimals. Starting at the right most decimal place in the answer, count the same number of decimal places going left. Place the decimal point here. The number of decimal places in the answer should be the same as the total number of decimal places in the question. Evaluate x x Step 1: Line up the numbers according to the last column. Ignore the decimal point and place values! x Step 2: Multiply 5 by Line up the product with the numbers in the question x Step 3: Multiply 0 by Indent the product one space to the left x Step 4: Multiply 3 by Indent the product two spaces to the left. Page 29

30 98.76 x x Step 5: Multiply 1 by Indent the product three spaces to the left. Step 6: Add the products column by column starting at the right x Step 7: Count the total number of decimal places in the numbers being multiplied, five in this example. Your answer will have the same number of decimal places. Starting at the rightmost digit, count the appropriate number of spaces and place the decimal point. The final answer is The last 0 can be dropped as this does not change the value (or magnitude) of the number. Practice questions: 33. Multiply by Multiply by Page 30

31 Division (by hand) One way to divide two decimals is to make the divisor a whole number. To do this, count the number of decimal places in the divisor and multiply by a multiple of 10 that will make the divisor a whole number (Rule of thumb: the number of zeros in the multiple of 10 should equal the number of decimal places you are trying to get rid of). For example, 12.4 should be multiplied by 10 since multiplying by 10 moves the decimal place one place to the right x 10 = 124. However, in order to keep the division problem equivalent to the question given, you MUST also multiply the dividend by the same multiple of 10! Note that, the dividend can remain a decimal. For example, to divide by 3.2, multiply the dividend and divisor by 10. The division problems becomes Once the divisor is a whole number, proceed to do the division problem as you would divide any two whole numbers. If the dividend is a decimal, put a decimal point in the quotient once you meet the decimal point in the dividend during long division (see Example 2). Evaluate x 10 = 12 Step 1: You want to make the divisor, 1.2, into a whole number. Since 1.2 has one decimal place, multiply by x 10 = 3588 Step 2: Since 1.2 was multiplied by 10, the dividend, MUST also be multiplied by 10. The division problem becomes Step 3: Do long division as you would normally divide two whole numbers Final answer is 299. Example 2: Evaluate x 100 = 7 Step 1: You want to make the divisor, 0.07, into a whole number. Since 0.07 has two decimal places, multiply by 100. Page 31

32 x 100 = Step 2: Since 0.07 was multiplied by 100, the dividend, MUST also be multiplied by 100. The division problem becomes Step 3: Do long division as you would normally divide two whole numbers Once you meet the decimal point in the dividend, put a decimal point in 21 the quotient Put a decimal point in the quotient before bringing the 7 down Practice questions: 35. Evaluate Evaluate Conversions between Fractions, Decimals and Percent Converting Fractions to Decimals To convert a proper or improper fraction into a decimal, divide the numerator by the denominator using long division or a calculator. The decimal equivalent of a proper fraction will always be less than 1 but greater than 0. The decimal equivalent of an improper fraction will always be greater than 1. Convert 6 into a decimal = 0.4 To convert a mixed number into a decimal, divide the numerator by the denominator for the fractional part and then add the whole number to the resulting decimal. Page 32

33 Convert 3 1 into a decimal = = Some useful fraction and decimal equivalents to remember: 1 2 = = = = = = = = = = Converting Decimals to Fractions To convert a decimal to a fraction, follow the following steps: - Write the decimal in fraction form with a denominator of 1 and decimal in the numerator - Multiply both numerator and denominator by a multiple of 10 that will make the decimal a whole number. - Reduce the fraction if you can. Convert 0.82 into a fraction. First, write the decimal in fraction form by writing the decimal over Next, multiply both the numerator and denominator by 100 since we want to get rid of two decimals places in x = Now, reduce the fraction. Page 33

34 82 = The final answer is Practice question: 37. Which of the following fractions are equivalent to 0.05? a) 19 b) c) d) 10 Introduction to Percent Percent means per hundred. Like fractions, percents are a way to represent parts of one whole. However, in percent one whole is always considered to be 100%. 1 whole = 100% Converting Decimals or Fractions to Percent To convert a fraction into a percent, multiply by and then simplify as much as you can (e.g. reduce the fraction, convert an improper fraction to a mixed number, etc.). Another way to convert a fraction into a percent is to convert the fraction into a decimal first and then multiply by 100. Convert 1 into a percentage. 3 1 x 100 = = Step 1: Multiply the fraction by Step 2: Change the improper fraction into a mixed number. Final answer is %. Page 34

35 To convert a decimal into a percent, multiply the decimal by 100. The shortcut method with multiplying decimals by 100 is to move the decimal place over to the right two times. Convert into a percentage x 100 = 2.8% Practice question: 38. What is 2 expressed as a percent? 5 a) 2 % 5 b) 0.4 % c) 4% d) 40% Converting Percent to Decimals or Fractions To convert a percent into a fraction, write the percent as the numerator of a fraction with a denominator of 100. (This is the same as dividing the percent by 100). Simplify fully. percent 100 Convert 52% into a fraction. 52% = = Step 1: Write the percent as the numerator. Denominator is 100. Step 2: Reduce the fraction. Final answer is To convert a percent into a decimal, divide the percent by 100. The shortcut method to divide decimals by 100 is to move the decimal place over to the left two times. Page 35

36 Convert 3.9% into a decimal. 3.9% 100 = Final answer is Practice question: 39. What is 34% expressed as a fraction? a) b) 34 1 c) d) Percent Common Word problems involving percent: Examples of the three most common word problems involving percent are: What is 15% of 30? 30 is 15% of what number? 15 is what percent of 30? To solve word problems in the format What is x% of y?, follow these steps: 1. Convert the percentage into a decimal. 2. Multiply the decimal by the number given in the question. Solution for What is 15% of 30? 15% = = x 30 = 4.5 Therefore, 15% of 30 is 4.5. Page 36

37 To solve word problems in the format y is x% of what number?, follow these steps: 1. Convert the percentage into a decimal. 2. Divide the number given in the question by the decimal. Solution for 30 is 15% of what number? 15% = = = 200 Therefore, 30 is 15% of 200. To solve word problems in the format x is what percent of y?, follow these steps: 1. Divide the part, x, by the whole, y. 2. Multiply the resulting quotient by 100. Solution for 15 is what percent of 30? = x 100 = 50 Therefore, 15 is 50% of 30. Practice questions: 40. What is 60% of 500? a) 3000 b) 300 c) 30 d) is 75% of what number? a) 20 b) 200 c) d) is what percent of 50? a) 40% b) 25% c) 4% d) 400% Page 37

38 Sales Tax Sales tax is expressed as a certain percentage of a sales price. The sales tax amount (\$) is added to the selling price in order to get the final total price. When solving for the total price of a product after taxes use the following steps: Method 1: 1. Find the sales tax amount by converting the sales tax percentage into a decimal and then multiplying by the selling price. 2. Add the sales tax amount to the original selling price. Method 2: OR 1. Convert the sales tax percentage into a decimal. Then add 1. (The decimal part of this number represents the amount of tax; 1 represents the original sales price). 2. Multiply the number from the previous step by the original sales price to get the total final price. Note: when working with dollar amounts, always round your answer to 2 decimal places. A t-shirt costs \$ What is the final price of this t-shirt after a tax of 13% is added? Method 1: Step 1: 13% 100 = x = 2.73 Step 2: = Therefore, the final price of the t-shirt is \$ Method 2: Step 1: 13% 100 = = 1.13 Step 2: 1.13 x = Therefore, the final price of the t-shirt is \$ Practice question: 43. What is the final price of a textbook that costs \$187 after 13% tax is added? Page 38

39 a) b) c) d) Price Discounts Discount is usually expressed as a certain percentage of a selling price (e.g. 30% off). The sales tax amount (\$) is subtracted from the selling price in order to get the final price. When solving for the total price of a product after a discount has been applied use the following steps: Method 1: 1. Find the discount amount by converting the discount percentage into a decimal and then multiplying by the original price. 2. Subtract the discount amount from the original price. Method 2: OR 1. Convert the discount percentage into a decimal. Subtract this decimal from 1. (This decimal represents what part of the original price is the discounted price.) 2. Multiply the number from the previous step by the original price to get the final discounted price. A camera costs \$299. Right now, the camera is on sale at 15% off. What is the discounted price of the camera? Method 1: Step 1: 15% 100 = x 299 = Step 2: = Therefore, the discounted price of the camera is \$ Method 2: Step 1: 15% 100 = = 0.85 Page 39

40 Step 2: 0.85 x 299 = Therefore, the discounted price of the camera is \$ Practice question: 44. A box of pens costs \$ The pens are currently on sale at 30% off. What is the discounted price of a box of pens? a) b) c) 5.40 d) Percent Increase Questions that involve a percent increase can be solved using the same strategies as for prices after taxes. Taxes are really just a percent increase. To find the number after percent increase: Step 1. Express percent as a decimal by dividing the percent by 100. Step 2. Multiply the decimal by the number representing the total to get the increase amount. Step 3. Add the increase amount and the original amount. The sales of company A totaled \$389,000 in In 2011, the sales increased by 3%. What is the amount of sales for company A in 2011? Solution: 3% 100 = x = = Therefore, the sales in 2011 were \$400, 670. Practice Question: 45. In the fall semester, a total of 780 students visited the Tutoring and Learning Centre. In the winter semester, the number of students increased by 5%. What is the number of students who visited the Tutoring and Learning Centre in the winter semester? a) Page 40

41 b) 1170 c) 939 d) 819 Percent Decrease Questions that involve a percent decrease can be solved using the same strategies as for prices after discount. Discounts are really just a percent decrease. To find the number after percent decrease: Step 1. Express percent as a decimal by dividing the percent by 100. Step 2. Multiply the decimal by the number representing the total to get the decrease amount. Step 3. Subtract the decrease amount from the original amount. The population of a small northern town was 6780 people. This year, the population decreased by 3.2%. What is the population of the town this year? Solution: 3.2% 100 = x 6780 = = 217 (We cannot have 0.96 of a person. Therefore, round the answer to the nearest whole number.) = 6563 Therefore, the population of the town this year is 6583 people. Practice Question: 46. Last year there were 3180 cases of the flu treated at hospital A. This year, the number of cases of flu decreased by 12.7%. What is the number of cases of flu for this year? a) 404 b) 2776 c) 3584 d) 3139 Finding the Percent in Percent Increase or Percent Decrease. When finding the percent by which a number has increased or decreased, use the following guidelines: Page 41

42 Find the difference between the original number and the number after increase/decrease 1. Divide the difference by the original number. (You should get a decimal answer.) 2. Multiply the decimal by 100 to get a percentage. Note: The percent can be larger than 100%. Examples: Problem 1: The average price of a detached home in city A was \$506,000 in By 2012, the average price increased to \$745,000. By what percentage has the average home price increased from 2010 to 2012? (State the final answer to 2 decimal places.) Solution: = = x 100 = 47.23% Therefore, the average home price increased by 47.23% from 2010 to Problem 2: In 1990 the number of families in the GTA relying on social assistance was By 2000 this number decreased to By what percentage did the number of families in the GTA relying on social assistance decrease between 1990 and 2000? (State the final answer to the nearest whole percent.) Solution: = = x 100 = 10% Therefore, there was a 10% decrease in the number of families in the GTA relying on social assistance between 1990 and Practice Questions: 47. Due to inflation, the price of food has increased. If a loaf of bread cost \$1.99 five years ago and costs \$2.49 today, what is the percent increase in the price of a loaf of bread? Page 42

43 a) 20% b) 25% c) 10% d) 80% 48. A company s profit was \$897,000 in Following recession, the company s profit decreased to \$546,000 in What was the percent decrease in the company s profit between 2010 and 2011? a) 64% b) 27% c) 13% d) 39% 7. Ratio and Proportion A ratio is a comparison of one number to another. The order, in which the ratio is written, matters. For example, 1 (apple) to 2 (oranges) is not the same as 2 (apples) to 1 (orange). Ratios can be written in three different ways: With a colon e.g. 5:3 In words e.g. 5 to 3 As a fraction e.g. 5 3 Ratios should be simplified to lowest terms (like fractions). For example, 6:3 can be simplified to 2:1 by dividing each number in the ratio by 3. Sample question: 49. In a bag there 7 red marbles for every 21 green marbles. Write the ratio of green to red marbles in lowest terms. A proportion is made up of two equal ratios. For example, 2:3 = 4:6 Proportions can be solved using cross multiplication. Page 43

44 Solve the following proportion. 3:7 = 45:x 3 = 45 7 x Step 1: Write the proportion in fraction form. Pay special attention to the order of numbers. 3 = 45 7 x Step 2: Cross multiply. Remember to keep the equal sign between the two sides. 3x = 45(7) Step 3: Move 3 to the right side of the equation by dividing the right side by 3. x = 45(7) 3 x = 15(7) 1 x = 105 Step 4: Reduce the 45 and 3 by dividing each number by 3. Step 5: Evaluate the right side of the equation. Final answer. Practice Questions: 50. Solve for x. 2:3 = x: Solve for x. x:2 = 3:4 52. Solve for x. x = Solve for x. 3 = 30 x 5 Page 44

45 8. Exponents power 6 8 exponent base Exponents are used to write repeated multiplication. 6 8 written in expanded form as repeated multiplication is 6 x 6 x 6 x 6 x 6 x 6 x 6 x 6. When working with powers, it is very important to identify the base correctly. If the base on a power is negative, it must be included in brackets. For example, ( 8) 2 = ( 8)( 8) = 64 If there are no brackets, the base is positive but the power is negative. For example, 8 2 = (8)(8) = 64 As you can see from the above example, ( 8) 2 is NOT the same as 8 2. Examples: Write each power in expanded form as repeated multiplication. 3 4 = (3)(3)(3)(3) ( 9) 3 = ( 9)( 9)( 9) ( 2) 5 = ( 2)( 2)( 2)( 2)( 2) To evaluate a power means to find its numerical value. This can be done on a calculator or by hand using repeated multiplication. Be extra careful with negative signs! Evaluate the following powers. Page 45

46 a) 7 3 b) 9 4 c) ( 2) 5 d) ( 3 4 )2 Solutions: a) 7 3 = 7 x 7 x7 = 343 b) 9 4 = 9 x 9 x 9 x 9 = 6561 c) ( 2) 5 = ( 2) ( 2) ( 2) ( 2) ( 2) = 32 d) ( 3 4 )2 = ( 3 ) 4 (3) = Sample questions: 54. What is 15 3 written as repeated multiplication? a) ( 15)( 15)( 15) b) ( 15)(15)( 15) c) (15)(15)(15) d) (15)(15)(15) 55. Evaluate ( 7) 3 a) 49 b) 49 c) 343 d) Scientific Notation Scientific notation is commonly used to represent very large or very small numbers in a convenient way. Scientific notation is written in the following format using a power with base 10. m x 10 b m represents the mantissa. 1 m < 10 The mantissa MUST be equal to or greater than 1 but less than 10. b is the exponent on a power with base 10. Very large numbers will have a positive exponent. Very small numbers will have a negative exponent. Page 46

47 To write a number in scientific notation: Move the decimal to a position immediately to the right of the first nonzero digit. Scan the number from left to right. Count the number of place values you had to move the decimal point. This is the value of the exponent. - If you moved the decimal point to the left, make the exponent positive. - If you moved the decimal point to the right, make the exponent negative. Drop all trailing or leading zeroes. The remaining number is the mantissa. Write the number in scientific notation as a product of the mantissa and power with base 10. Examples: 1. Write 450,900,000,000 in scientific notation. 4.50,900,000,000 Step 1: Move the decimal to a position immediately to the right of the first nonzero digit. Scan the number from left to right. 4.50,900,000,000 Step 2: Count the number of place values the decimal point was moved. In this case, the decimal point was moved 11 spaces to the left. Therefore, the exponent on base 10 will be positive ,900,000,000 Step 3: Drop the trailing zeros to get the correct mantissa x Step 4: Write the number in scientific notation as a product of the mantissa (from step 3) and power of 10 with correct exponent (from step 2). 2. Write in scientific notation Step 1: Move the decimal to a position immediately to the right of the first nonzero digit. Scan the number from left to right Step 2: Count the number of place values the decimal point was moved. In this case, the decimal point was moved 5 spaces to the right. Therefore, the exponent on base 10 will be negative Step 3: Drop the leading zeros to get the correct mantissa x 10 5 Step 4: Write the number in scientific notation as a product of the mantissa (from step 3) and power of 10 with correct exponent (from step 2). Page 47

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