# PREPARATION FOR MATH TESTING at CityLab Academy

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1 PREPARATION FOR MATH TESTING at CityLab Academy compiled by Gloria Vachino, M.S. Refresh your math skills with a MATH REVIEW and find out if you are ready for the math entrance test by taking a PRE-TEST (see back page) Calculators are not allowed during the test, so make sure to practice without a calculator. To sign up for the math test, Property of Boston University, CityLab Academy, 2011

2 Table of Contents TOPIC PAGE Adding & Subtracting Decimals 3 Multiplying Decimals 4 Dividing Decimals 5 Equivalent Fractions 6 Reducing Fractions 7 Types of Fractions 7 Converting Fractions 8 Adding & Subtracting Fractions 9 Multiplying Fractions 10 Dividing Fractions 11 Percents Signed Numbers 14 Exponents 15 Pre-test 16 PLEASE NOTE: This math review booklet covers most of the topics and provides examples of the types of problems that are on the math entrance test. Two topics that are not covered are basic algebraic equations and square roots. Reviews of these topics can be found online at the following websites: Basic Algebraic Equations Square Roots Property of Boston University, CityLab Academy,

3 ADDING AND SUBTRACTING DECIMALS When adding or subtracting numbers with decimal points: Write the numbers in a column. Line up the decimal points. EXAMPLE Step 3 Step 4 For whole numbers, place a decimal point after the number. Then add one or more zeros to the right of the decimal point. Add (or subtract) the numbers the same way as for numbers without decimal points. Bring the decimal point straight down into the answer EXAMPLE For this problem, re-write 4 as EXAMPLE ) = 2) = 3) = 4) 2, = 5) = 6) = 1) ) ) ) 2, ) ) Property of Boston University, CityLab Academy,

4 MULTIPLYING DECIMALS When multiplying numbers with decimal points: Count the number of decimal places (numbers to the right of the decimal point) in all the numbers being multiplied. Add to find the total number of decimal places. EXAMPLE decimal place x decimal place? 2 decimal places Step 3 Step 4 Multiply the numbers as if they were whole numbers without decimal points and record the answer. To determine where to put the decimal point in the answer, use the total number of decimal places. Start at the right of the answer and count to the left. Place the decimal point in front of the last number counted. If more decimal places are needed, add zeroes in front of the number. 31 x decimal place x decimal place decimal places EXAMPLE decimal places x decimal places decimal places To count 5 decimal places, add zeros in front of the 3. 1) 453 2) 5,751 3) ) x 0.03 x x 0.2 x 22 5) ) ) 555 x ) 950 x x 0.05 x ) ) ) ) ) ) ) ) Property of Boston University, CityLab Academy,

5 I. When dividing decimals by whole numbers: DIVIDING DECIMALS Divide as you would normally (ignoring the decimal point). Bring the decimal point straight up into the answer. (In other words, put the decimal point in the quotient directly above the decimal point in the dividend.) TIP! Know the parts of the division operation. Quotient Divisor Dividend Dividend divisor = quotient II. When dividing decimals by decimals: First move the decimal point in the divisor to the right to make it a whole number. Then move the decimal point in the dividend the same number of places to the right Move decimal point two places in both divisor and dividend. Step 3 Perform the division. Bring the decimal point straight up into the answer ) ) ) ) ) ) = 1) 600 2) 280 3) 50 4) 810 5) ) 7100 Property of Boston University, CityLab Academy,

6 EQUIVALENT FRACTIONS Equivalent fractions are two or more fractions that have the same value. To determine whether two fractions are equivalent: EXAMPLE 1 12 = Look at the fraction with the larger numbers. Determine what number the larger numerator needs to be divided by to give the numerator in the other fraction = Step 3 Divide the denominator of the fraction with the larger numbers by the same number. Check to see that the fractions are equivalent: If the numerator and denominator of one fraction can be divided by the same number to give the numerator and denominator of the second fraction, then the fractions are equivalent = = = 4 EXAMPLE 2: 15 = 5 but 8 4 ( is the symbol for not equal to ) because 15 3 = 5 but Determine whether the following fractions are equivalent. 1) 15 = 3 2) 3 = 1 3 ) 7 = 49 4) 2 = ) yes 2) no 3) yes 4) yes Property of Boston University, CityLab Academy,

7 REDUCING FRACTIONS When the only number that can evenly divide the numerator and denominator of a fraction is 1, the fraction is said to be reduced to lowest terms or simplified. To reduce a fraction: Divide the numerator and denominator by the greatest common factor. In the fraction at the right, the greatest common factor is 7 (the largest number that goes into both 14 and 63). Check to make sure the fraction has been reduced completely! As stated above, in a reduced fraction, only 1 can evenly divide both the numerator and denominator. EXAMPLE In the example above, the only number that can evenly divide both 2 and 9 is 1. Reduce the following fractions. 1) 6 = 2) 10 = 3) 3 = 4) 6 = ) 1 2) 1 3) 3 fraction cannot be 4) further reduced 7 TYPES OF FRACTIONS A. PROPER FRACTIONS A fraction is proper if the numerator is smaller than the denominator. B. IMPROPER FRACTIONS A fraction is improper if the numerator is larger than (or equal to) the denominator. PROPER FRACTIONS IMPROPER FRACTIONS C. MIXED NUMBERS (also called mixed fractions) A mixed number contains a whole number and a fraction. MIXED NUMBERS Property of Boston University, CityLab Academy,

8 CONVERTING FRACTIONS To convert an improper fraction to a mixed number: Divide the numerator by the denominator. Write the answer as a mixed number: In the example, the quotient 2 becomes the whole number and the remainder 11 becomes the numerator in the fraction. The denominator stays the same. EXAMPLE Step 3 If necessary, reduce the fraction to lowest terms. To convert a mixed number to an improper fraction: Multiply the denominator by the whole number and then add the product to the numerator. Place the sum over the denominator. EXAMPLE x 6 = = Convert the following improper fractions to mixed numbers. 1) 13 = 2) 25 = 3) 54 = 4) 16 = Convert the following mixed numbers to improper fractions. 5) 2 5 = 6) 13 2 = 7) 9 1 = 8) 11 6 = ) 1 5 2) 3 4 3) 7 5 4) 3 1 5) 23 6) 41 7) 46 8) Property of Boston University, CityLab Academy,

9 ADDING and SUBTRACTING FRACTIONS When adding or subtracting fractions: Convert mixed numbers to improper fractions. EXAMPLES Find the lowest common denominator for the fractions. (A common denominator is a number that can be evenly divided by both denominators.) ADDITION SUBTRACTION Step 3 Convert each of the original fractions to equivalent fractions using the lowest common denominator is the lowest common denominator 3 8 =? =? 21 is the lowest common denominator =? =? Step 4 Add (or subtract) the numerators. Do not add or subtract the denominators = = 5 21 (Please note that the method described above is just one of several methods used in the addition and subtraction of fractions.) 1) 3 2 = 2) = 3) = 4) = 5) = Property of Boston University, CityLab Academy,

10 1) 1 2) 15 3) 3 1 4) 103 = ) 19 = Property of Boston University, CityLab Academy,

11 MULTIPLYING FRACTIONS When multiplying fractions: Convert mixed numbers to improper fractions. EXAMPLE 1 4 x 2 x 1 1 x Rewrite whole numbers as fractions: 5 = 5 1 Cancel (if possible). 13 x 2 x 8 x Step 3 Multiply straight across. In other words, multiply all numerators, then all denominators. 13 x 2 x 8 x 5 = x 3 x 7 x Step 4 Simplify your answer. If you did not cancel before multiplying, you will need to reduce the answer. Improper fractions are generally converted to mixed numbers for the final answer = ) 3 x 5 = 2) 2 x 5 = 3) 52 x 5 = 4) 33 x 13 5) 8 x ) 4 x 5 = 7) 4 x 1 5 = 8) 12 x 6 = 9) 14 x 7 10) 21 x ) 5 2) 5 3) ) ) 2 6) 5 7) 2 4 8) 36 9) ) Property of Boston University, CityLab Academy,

12 DIVIDING FRACTIONS When dividing fractions: Step 3 Step 4 Step 5 Step 6 Convert all mixed fractions to improper fractions. Convert whole numbers to fractions. Invert the divisor. Change the division sign to multiplication. Cancel (if possible). Multiply straight across: Reduce if needed divisor 5 becomes x x 9 = 117 = x ) 8 3 2) 6 3 3) 5 4 4) ) ) ) ) ) 1 5 2) 4 3) ) 1 5) 23 6) 1 6 7) 15 8) Property of Boston University, CityLab Academy,

13 Percent means per one hundred. % is the symbol used to indicate percent. The meaning of 15% is 15 parts in 100 parts. Percents can be written as fractions: 15% = PERCENTS There are several methods for solving percent problems. In this review, the proportion method is used. With the proportion method, percent problems are solved using equivalent fractions. (Review the section above on equivalent fractions.) Percent problems are commonly written as word problems. The biggest challenge in solving percent problems is understanding the wording so that the equivalent fractions can be set up properly. An example of a percent problem is: What is X% of Y? Another way of stating this problem is: How many parts out of Y are equal to X parts out of 100? To set up equivalent fractions, follow these guidelines: i) Numbers after the word of are always in the denominators. ii) One of the denominators will always be 100. iii) The number in front of the percent sign (%) always has a denominator of 100. So for the problem What is X% of Y?, the equivalent fractions are set up as shown below: Fraction 1 Fraction 2 X = parts 100 Y EXAMPLES A) What is 74% of 50? Another way of stating this problem is: How many parts out of 50 are equal to 74 parts out of 100? Write the equivalent fractions. 74 = how many parts? Follow the rules for equivalent fractions: a) Look at the two denominators and divide the larger by the smaller: = 2 b) Divide the numerator by the same number: 74 ( 2 ) = how many parts? = ( 2) c) Write the equivalent fractions: 74 = Step 3 The problem is solved: 74% of 50 is 37. B) 42 is what percent of 600? Property of Boston University, CityLab Academy,

14 Another way of stating this problem is: 42 parts out of 600 is equivalent to how many parts out of 100? Write the equivalent fractions: 42 = how many parts? Follow the rules for equivalent fractions: a) Look at the two denominators; divide the larger by the smaller: = 6 b) Divide the numerator by the same number: 42 ( 6) = how many parts? = ( 6) c) Write the equivalent fractions: 42 = Step 3 The problem is solved: 42% of 600 is 7% (remember that 7 = 7%) ) Find 40% of 50 2) 20 is what % of 250? 3) What percent of 80 is 60? 4) 40 is 80% of what number? 5) 32% of is 64 6) 35 is what % of 700 1) 20 2) 8 3) 75 4) 50 5) 200 6) 5 Property of Boston University, CityLab Academy,

15 SIGNED NUMBERS When adding or subtracting two numbers with different signs: Subtract the smaller number from the larger number. Give the answer the sign of the larger number. Please note: A signed number problem can be written. in several different ways: ( 2) The answer is 7 for all three problems! When multiplying or dividing two signed numbers: a. the answer is positive if both numbers have the same sign. b. the answer is negative if the numbers have different signs. EXAMPLE 4 + ( 10) =? 10 minus 4 equals 6 The larger number in the problem is 10 and it has a negative sign. Therefore the answer will also have a negative sign. 4 + ( 10) = 6 EXAMPLES ( 9) x ( 6) = 54 ( 10) ( 2) = 5 ( 5) x (4) = 20 3 x 4 = ) ( 8) + 4 = 2) ( 6) + ( 3) = 3) 14 + ( 2) = 4) 5 13 = 5) 3 x ( 7) = 62) 15 ( 5) = 7) ( 8 ) x ( 5) = 8) 2 6 = ) 4 2) 9 3) 12 4) 8 5) 21 = 5 1 6) 3 7) 40 8) 5 EXPONENTS Property of Boston University, CityLab Academy,

16 Exponents show how many times a number (called the base) is multiplied times itself. A number with an exponent is said to be "raised to the power" of that exponent. Example: Three raised to the power of two is written: is the base and 2 is the exponent (or power) 3 2 = 3 x 3 = 9 I. To add or subtract numbers with exponents: Find the value of each number with an exponent Add the values together: EXAMPLE =? 3 3 = 3 x 3 x 3 = 27 and 2 3 = 2 x 2 x 2 = = 35 Therefore: = 35 II. To multiply numbers with exponents: i) If the bases are the same, add the exponents and then perform the operation. EXAMPLE 2 3 x 2 2 = 2 5 = 32 because (2 x 2 x 2) = 8 and (2 x 2) = 4 and 8 x 4 = 32 ii) If the bases are not the same: Find the value of each number with an exponent. Multiply the values together. EXAMPLE 5 2 x 3 3 = 675 because (5 x 5 ) = 25 and ( 3 x 3 x 3) = 27 and 25 x 27 = 675 1) 3 3 x 6 2 = 2) = 3) = 4) 5 3 x 5 2 = 5) ) = 7) = 8) 3 3 x 2 4 = 1) 972 2) 28 3) 1 4) 3125 PRE-TEST 5) 24 6) 2 7) 100 8) 432 If you can accurately solve the following 24 problems in 30 minutes without a calculator, you are ready for the entrance test. (On the actual test, you will have 1 hour to complete 48 questions.) Property of Boston University, CityLab Academy,

17 1) = 2) = 3) = 15) x 8 = 16) = ) 7 x 6 = 9 17) = 5) ) = 19) 25% of? = 175 6) ) = 8) x 3 = 9) ) = 11) 12) ) = 4 1 x 1 = ) 4 2 x 4 4 = 21) 4 3 = ) 0.53 x ) 18 3 = 5 24) 7 36,425 1) ) 1 5/12 21) 1 2/5 2) ) 5/12 22) ) 12 13) 1 2/5 23) 30 4) 4 2/3 14) 52 24) 5203 remainder 4 5) 3 1/5 15) ) ) 1 3/20 7) 28/115 17) 9 29/35 8) ) 25.3 Answers 9) ) ) ) ) = Property of Boston University, CityLab Academy, 2011

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