# 1.1 Place Value of Whole Numbers

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1 1.1 Place Value of Whole Numbers Whole Numbers: Whole numbers can be listed as 0,1,2,3,4,5,6,7,8,9,10,11,... The "..." means that the pattern of numbers continues without end. Whole Number Operations Workbook Infinity: Infinity is the concept that numbers continue to get larger and larger with no definite end; after every large number comes even larger numbers. Infinity is that area of numbers beyond and larger than the numbers being dealt with in any given mathematical situation. Place Value: The particular position of a digit within a number determines its place value. For example, it the digit is 4 places from the left, the number is in the thousands place. 6,5 0 3,4 3 8,2 3 6,4 3 6 Period: A period is a set of digits separated by a comma. For example, the millions period in the number above is the third period from the right: 438. When a whole number is written using the digits 0 9 it is said to be in the standard form. The position that each digit occupies determines its place value. Example 1. What does the digit 4 mean in each number? a. 234,598 b. 456,901 c. 24,355,567,222 Answers: a. 4 thousands b. 4 hundred thousands c. 4 billions Copyright BobsMathClass.com All rights reserved 1

2 Your Turn Problem #1 What does the digit 7 mean in each number? a. 573,289: b. 213,570 c. 37,218,021,593 Writing Numbers in Words Hyphens: When writing a number between 21 and 99, excluding 30, 40, 50, 60, 70, 80 and 90, a hyphen must be used between the two numbers. Examples: 24 twenty four 73 seventy three 45 forty five (40 is spelled forty, not fourty) Commas: Commas are used to separate each period. The comma is and must be used only after the words: thousand, million, billion, trillion, etc. Examples: three thousand, five hundred eighty eight five million, twenty two thousand, eleven And: The word and is only to be used with numbers that have decimals. So for now, do not write the word and. Procedure: When asked to rewrite a number using words: Proceeding left to right, write in words the number in each period, then write its period name (example: trillion, million, etc...), then write a comma, then proceed to the next period, etc... Note: The period on the right (the last period) has no period name. Example 2a: Rewrite using words: 72,417 Answer: Seventy-two thousand, four hundred seventeen. Copyright BobsMathClass.com All rights reserved 2

3 Example 2b. Rewrite using words: 12,503,438,236,473 Answer: Twelve trillion, five hundred three billion, four hundred thirty-eight million, two hundred thirty-six thousand, four hundred seventy-three. Your Turn Problem #2 Rewrite using words a) 9,207: b) 3,429,718: Writing Words into Numbers Procedure: When asked to rewrite a written number in words into numbers using digits: Proceeding left to right, for each period (separated by commas), write the number using digits and place commas where they are placed in the written form using words. If a period is not written, write 000, and continue to the next period. Example3a: Rewrite using numbers: Four billion, three hundred million, four hundred eight thousand, forty-six Answer: 4,300,408,046 Example 3b: Rewrite using numbers: Fifty-six trillion, six million, eight Answer: 56,000,006,000,008 Your Turn Problem #3 Rewrite using numbers: a) One hundred thirty-five thousand, four hundred two; b) Four billion, four hundred eight thousand, forty-six : Copyright BobsMathClass.com All rights reserved 3

4 1.1 Homework: Place Value of Whole Numbers Complete the place value system Tens 6, 5 3 5, 8 2 0, 7 2 9, Ones Give the place values for the indicated digits 1. 8 in the numeral 7, in the numeral 27,573, in the numeral 208,417, in the numeral 347,123,831, in the numeral 429, in the numeral 8,675,309 Write each of the following in words 7. 21: : 9. 3,501: ,880: Copyright BobsMathClass.com All rights reserved 4

5 1.1 Homework: Place Value of Whole Numbers cont. Whole Number Operations Workbook Write each of the following in words ,058,012: 12. 7,012,000,030,008: Write each of the following numbers with digits instead of words 13. Forty-seven: 14. Three hundred twenty-seven: 15. Five thousand, eighty-two: 16. One hundred thirty-five thousand, four hundred two: 17. Eight trillion, seven thousand: : 18. Two million, four hundred thousand, eleven: : 19. Forty-three thousand, nine hundred four: 20. Eight million, two hundred, eighty: : Copyright BobsMathClass.com All rights reserved 5

9 Comparing Numbers Whole numbers can be shown on a number line From the number line, we can see the order of numbers. For example, we can see that 2 is less than 7 because 2 is to the left of 7. For any two numbers on a number line, the number to the left is always the smaller number, and the number to the right is always the larger number. We use the inequality symbols < or > to write the order of numbers. Inequality Symbols For any whole numbers a and b: 1. a < b (read a is less than b) means a is to the left of b on the number line. 2. a > b (read a is greater than b) means a is to the right of b on the number line. > means greater than < means greater than Note: The inequality symbol must always point toward the smaller number. You could also say it opens up to the larger number. Examples: 16 > 5 3 < 8 Example 5. Place the correct inequality symbol between the two numbers. Answers a) a) 15 > 12 b) 0 11 b) 0 < 11 Your Turn Problem #5 Place the correct inequality symbol between the two numbers. a) b) Copyright BobsMathClass.com All rights reserved 9

10 1.2 Homework: Rounding and Ordering of Whole Numbers Round each of the following numbers to the nearest ten ,512 Whole Number Operations Workbook 3. 13, , , , , 302 Round each of the following numbers to the nearest hundred , , , , , , Copyright BobsMathClass.com All rights reserved 10

11 1.2 Homework: Rounding and Ordering of Whole Numbers cont. Whole Number Operations Workbook Round each of the following to the nearest thousand 19. 7, , , , ,412, , ,000, 824 Round each of the following to the indicated place value ,212 : ten thousand ,873,712 : hundred thousand Answer: Answer: ,771,333 : million ,561,202 : ten million Answer: Answer: Place the correct inequality symbol between the two numbers. ( < or > ) Copyright BobsMathClass.com All rights reserved 11

15 Example 3. The yearly profit for DR Construction was \$78,216 in 2004, \$153,917 in 2005, and \$85,098 in What is the total profit for these three years? Solution: The key word in this problem is total The total profit for the three years was \$317,231 Your Turn Problem #3 Laura s yearly salary is \$58,500. Next year, her salary will increase by \$7,000. What will her yearly salary be next year? Answer: Copyright BobsMathClass.com All rights reserved 15

16 1.3 Homework: Addition of Whole Numbers Name the property that is illustrated = : (9 + 12) = (3 + 9) + 12 : (5 + 6) = (4 + 5) +6 : = 7 : 5. (11 + 4) + 5 = 11 + (4 + 5) : = : Add the following , ,916 Copyright BobsMathClass.com All rights reserved 16

17 1.3 Homework: Addition of Whole Numbers cont , , , , , , , , , , Find the total of 23 and Find the sum of 867 and Find a number that is 18 more than What is the sum of 316 and 400? 31. A bowler scored 201, 157, and 198 in three games. What was the total score for those games? 32. Driving to California, Allison drove 871 miles on Monday, 612 miles on Tuesday, and 977 miles on Wednesday. How many miles did she drive on the three days? 33. Corrine spent \$364 for tuition, \$583 for books, and \$35 for parking during one semester. What was the total cost for tuition, books, and parking for that semester? Copyright BobsMathClass.com All rights reserved 17

18 1.4 Subtraction of Whole Numbers Whole Number Operations Workbook Subtraction can be expressed by the equation a b = c, where a is the minuend, b is the subtrahend, and c is the difference. a b = c is only true if the inverse c + b = a is true. Subtraction is the operation where one amount is "taken away" from another amount leaving the difference. Example: 18 minuend 5 subtrahend 13 difference Phrases that indicate Subtraction: Minus Subtract Takeaway Difference Subtracted from * Less than * Decreased by Example 1: Translated 12 minus The difference of 9 and subtracted from * 4 less than * Note: The order for the phrases with * are reversed In this section, we are only working with whole numbers, i.e., 0, 1, 2, 3 We are not working with negative numbers, but we understand a little about them. If the temperature is 17, it s cold. If your checking account is \$ 24, you re in the negative. So, 4 less than 10 translates to If you did it incorrectly, and wrote 4 10, the answer would be 6. Subtraction is not commutative; order does matter. Copyright BobsMathClass.com All rights reserved 18

19 Your Turn Problem #1 Translate and Simplify a) 15 subtracted from 49. b) The difference of 8 and 5. Answer: Answer: Borrowing Borrowing is the process that is used when the lower digit is larger than the upper digit. Procedure for Subtraction - Borrowing: 1. Line out the digit to the left of the upper digit, subtract 1 from it and write this new digit above. 2. Line out the original upper digit, add 10 to it, and write this number above. 3. Subtract the lower digit. 4. Proceed to the next column on the left. Example 2a: Solution: Answer: 125 Example 2b: Solution: Answer: 485 Copyright BobsMathClass.com All rights reserved 19

21 1.4 Homework: Subtraction of Whole Numbers Perform the indicated subtraction Whole Number Operations Workbook ,512 2,863 Copyright BobsMathClass.com All rights reserved 21

22 1.4 Homework: Subtraction of Whole Numbers cont. Whole Number Operations Workbook ,521 5, , ,000 9, , ,200 4, ,000 15, Subtract 23 from Subtract 965 from 14, Find the difference of 24 and Find the difference of 76 and David's monthly pay of \$2600 was decreased by \$475 for withholding. What amount of pay did he receive? 45. Henry has \$728 in cash and wants to buy a laptop that costs \$1,241. How much more money does he need? 46. Brian s checking account has a balance of \$575. Brian wrote three checks for \$54, \$37, and \$143. What was the new balance in the checking account? Copyright BobsMathClass.com All rights reserved 22

23 1.5 Multiplication of Whole Numbers Whole Number Operations Workbook Multiplication is the process that shortens repeated addition with the same number. For example, = 5 8 = 40 (Multiplication symbol: or ) The multiplication of two numbers a and b can be expressed by the equation a b = c are factors and c is called the product (a and b are also called multiplicands). where a and b Example: Factors (or multiplicands) product Notice that the order for multiplication does not matter is the same as This is called the Commutative Property of Multiplication. Commutative Property of Multiplication a b = b a where a and b are numbers. Example: 5 7 = 7 5, 35 = 35 Multiplicative Identity The number 1 is the identity of multiplication because for any number a, a 1 = a and 1 a = a. The number 1 is the identity element of multiplication because when 1 is multiplied by any number, the resulting product is the original number. Example: 5 1 =5 Associative Property of Multiplication a (b c) = (a b) c where a, b and c are numbers. Example: (9 5) 7 = 9 (5 7) The numbers are in the same order. The parentheses are in different positions. Copyright BobsMathClass.com All rights reserved 23

24 Multiplication Property of Zero Multiplying any whole number by 0 gives the product 0. Example: 5 0 =0 Distributive Property of Multiplication over addition For any whole numbers a, b, and c, a( b c) a b a c Example: (verify the result is 50 on both sides.) Your Turn Problem #1: State the indicated Property: Answers a) 12 1 =12 a) b) b) c) c) d) d) e) e) Multiplication Facts Even though we live in a society where calculators are cheap and readily available, to be competent and confident in mathematics, you should have memorized the multiplication facts for one digit numbers. Copyright BobsMathClass.com All rights reserved 24

25 Multiplication Table Multiplication of Multiple Digit Factors Procedure: If presented with a problem where one or more of the factors have more than one digit 1. Beginning with the one s place digit of the factor written below, multiply by all the digits of the factor written above (carrying as you go) writing the product directly below (called the partial product). 2. Next with the ten s place digit of the factor below, multiply it by all the digits written above (carrying above). Place a zero to the right and then the partial product from Step Continue this process until all the digits in the factor below have been multiplied. 4. Add the partial products for the product to the problem. Example: Example: Copyright BobsMathClass.com All rights reserved 25

27 Multiplying by multiples of 10. Example: Multiply: Solution: Answer: 1200 Notice we can take a shortcut by multiplying the 4 and 3 and then writing the same number of zeros at the end of each number being multiplied. Example: Solution: 6 4 =24, and there are three zeros at the end. Answer: 24,000 Your Turn Problem #4 Multiply the following. a) b) Answer: Answer: Copyright BobsMathClass.com All rights reserved 27

28 1.5 Homework: Multiplication of Whole Numbers Name the property that is being illustrated. (Do not evaluate, just name the property) : : : : : : : : : Perform the multiplication Copyright BobsMathClass.com All rights reserved 28

29 1.5 Homework: Multiplication of Whole Numbers cont. Whole Number Operations Workbook Copyright BobsMathClass.com All rights reserved 29

30 1.5 Homework: Multiplication of Whole Numbers cont. Whole Number Operations Workbook 40. Find the product of 12 and Find the product of 42 and One tablespoon of olive oil contains 125 calories. How many calories are in 3 tablespoons of olive oil? 43. The textbook for a course in history costs \$54. There are 35 students in the class. Find the total cost of the history books for the class. 44. The seats in the mathematics lecture hall are arranged in 12 rows with 34 seats in each row. Find how many seats are in this room. 45. An apartment building has three floors. Each floor has five rows of apartments with four apartments in each row. How many apartments are in the building? 46. A Koi farm has 7 fish ponds. If each pond has 2000 Koi, how many Koi does the farm have? 47. Each classroom in the Technology Center has 36 computer. If the Technology Center has 12 classrooms, how many computers does the Technology Center have in its classrooms? 48. A year has 365 days. How many days are there in 18 years? Copyright BobsMathClass.com All rights reserved 30

31 1.6 Division of Whole Numbers Whole Number Operations Workbook Division defines the operation of finding how many groups of a certain number (the divisor) are contained in another number or amount (the dividend). The answer is the quotient. Terminology divisor a c b quotient This is equivalent to b a = c dividend The following are equivalent forms of division. 12 3, 3 12 Both of these division problems equal 4. (12 is the dividend, 3 is the divisor, and 4 is the quotient.) Related Multiplication Sentence The division problem of 20 5 is defined to be the number that when multiplied by 5 gives = 4 related multiplication sentence: (The last two numbers, 5 and 4, multiply to equal the first number, 20.) Write the related multiplication sentence to: 63 9 = 7 = Division by 1 Any number divided by 1 is that same number: a 1 a, a 1 a Example: , Copyright BobsMathClass.com All rights reserved 31

32 Dividing a number by itself Any number divided by itself is 1. a a 1, a 1 a 1 Example: , Your Turn Problem #1 Divide the following a) b) 34 1 Answer: Answer: Dividing into zero (zero is the dividend) Zero divided by any nonzero number is zero. 0 a 0, a 0 0 Example: , (The last two numbers, 12 and 0, multiply to equal the first number, 0.) Division by zero (zero is the divisor) A nonzero number divided zero is undefined (Not Zero!). a 0 undefined, 0 12 : undefined Example: 12 0 undefined, 0 12 : undefined would be incorrect. (The last two numbers, 0 and 0, do not multiply to equal the first number, 12.) Copyright BobsMathClass.com All rights reserved 32

33 Zero divided by zero When zero is divided by zero, it is called indeterminate. 0 0 indeterminate, 0 0 : indeterminate The reason 0 0 is indeterminate is because we can actually write any number and the related multiplication sentence would be true. Example: Choose any number to write after the = sign. 0 0 =12 The related multiplication sentence would be 0 12 = 0 which is true. So we could write any number then and the related multiplication statement would be true. Please note: Some students have a tendency to draw a line through zeros,. Well this symbol has a meaning to it. It is no solution. Please do not use this symbol right now. It is used to say that there is no solution to an equation. We are not solving equations right now. So if the answer is undefined, you must write undefined. If the answer is indeterminate, you must write indeterminate. If the answer is zero, you must write 0. Your Turn Problem #2 Divide the following a) 43 0 b) 0 0 c) 0 21 a) b) c) Long Division Procedure: 1. Write the problem in long division format. If problem is given in this form "dividend divisor", change to:. 4, change to Copyright BobsMathClass.com All rights reserved 33

34 2. Determine the placement of the first digit on left in the quotient by determining how many digits of the dividend are necessary to accommodate the divisor. Take the first digit on the left in the dividend "4". Now ask, will 12 4? Answer: No. Now take the first two digits on left in the dividend "42". Ask, will 12 42? Answer: Yes Therefore, the first digit on the left in the quotient is directly above the last digit of Determine how many groups of the divisor are contained in the number obtained in Step 2. How many 12's are contained in 42? We want to find what number multiplied by 12 will give us a result as close to 42 without going over = 48 (too big) 12 3 = 36 Answer is Multiply the digit obtained from the quotient in step 3 by the divisor. Place that product below the dividend with the digit on the right directly below the digit in the quotient = Subtract product from dividend and then bring down next digit from dividend on right (use an arrow) Copyright BobsMathClass.com All rights reserved 34

35 6. Go back to Step 3, and repeat the process using the bottom line as the new dividend. How many "12's in 62? Answer is 5; 12 5 = 60. Place 5 in the quotient, then continue steps 4 and Repeat the process using the bottom line as the new dividend. How many "12's in 24? Answer is 2; 12 2 = 24. Place 2 in the quotient, then continue steps 4 and Answer: 352 You can check by multiplying the divisor and the quotient. This will give the dividend Your Turn Problem #3 Divide the following a) b) a) b) Copyright BobsMathClass.com All rights reserved 35

36 Division with Remainders Whole Number Operations Workbook For this section, when a division problem does not work out evenly, write the remainder preceded by an "R". Later we will do division with fractions and decimals. You can check by multiplying the divisor and the quotient and adding the remainder. This result should equal the dividend. Example: 361, Solution: 4, , Answer: 4202 R 27 Check 4, , , ,399 It checks. Your Turn Problem #4 Divide the following a b a) b) Copyright BobsMathClass.com All rights reserved 36

38 Useful Technique for Long Division When starting a long division problem, it many be beneficial to just write out the products of the divisor and numbers 1 through 9. Example: First rewrite in long division format Write the products of the divisor, 17, and the numbers 1-9 (shown to the right) Determine where the first number will be placed in the quotient (above the division box). 17 will not divide into 4 but it will divide into 46. Therefore the first digit of the quotient is written above the Looking at our products to the right, we want to find the product closest to 46 without going over. Answer: Write the 2 in the quotient, multiply, then subtract and bring down next digit Do it again. Find the product to the right closest to 128 without going over. Answer: Do it again. Find the product to the right closest to 90 without going over. Answer: Answer 275 R 5 Copyright BobsMathClass.com All rights reserved 38

39 1.6 Homework: Division of Whole Numbers Divide the following , , , ,648 8 Copyright BobsMathClass.com All rights reserved 39

40 1.6 Homework: Division of Whole Numbers cont , , , , , , , Copyright BobsMathClass.com All rights reserved 40

41 1.6 Homework: Division of Whole Numbers cont. 33. There are 517 students who are taking a field trip. If each bus can hold 42 students, how many buses will be needed for the field trip? 34. Construction of a fence section requires 8 boards. If you have 260 boards available, how many sections can you build? 35. Mark drove 408 miles on 12 gallons of gas. Find the mileage (in miles per gallon) of Mark s car. 36. A machine can produce 240 bottles per minute. How long will it take to produce 25,680 bottles? 37. A large container has 735 liters of a liquid. How many 2-liter bottles can be filled from the 735 liters? Simplify the following fractions Copyright BobsMathClass.com All rights reserved 41

42 1.7 Exponents Exponential Form A form of writing the product of a factor that repeats Example: or Base: The base is the factor being repeatedly multiplied Exponent: The exponent is a small number written to the right of the base and raised a half space. It indicates the number of bases being multiplied. Exponent (or power) Base 3 2 How to say it. Exponent: 2 squared or to the second power 3 cubed or to the 3rd power 4 to the fourth power etc. Examples 3 2 : two cubed or 2 to the 3 rd (power) 2 8 : eight squared or 8 to the 2 nd (power) 7 3 : three to the seventh (power) The word power is often left out. Procedure: To evaluate a number in exponential form Step 1: Step 2: Step 3: Rewrite as repeated multiplication. Multiply the repeated multiplication s. Perform any other operations Copyright BobsMathClass.com All rights reserved 42

43 Example 1. a) Evaluate: 4 3 b) Evaluate: Solutions: = 81 = 25 Your Turn Problem #1 a) Evaluate 3 5 b) Evaluate 2 7 Exponents of One A number with an exponent of 1 is simply equal to the number Example 2a. Answer: Evaluate: 1 8 = Exponents of Zero A number with an exponent of 0 is equal to 1. It doesn t make too much sense right now. The explanation will come later once we have learned a few algebra tools. Example 2b. Answer: Evaluate: 0 8 = Your Turn Problem #2 a) Evaluate 1 4 b) Evaluate 0 9 Copyright BobsMathClass.com All rights reserved 43

44 Example 3. Evaluate: Solution: First rewrite each as repeated multiplication Multiply the repeated multiplication s Perform any other operations. Answer: 81 Your Turn Problem #3 Evaluate Answer: Example 4. Evaluate: Solution: First rewrite each as repeated multiplication: Multiply the repeated multiplication s Perform any other operations. Answer: 144 Note: If the base is 1, it doesn t matter what the exponent is. The result will always be 1. Your Turn Problem #4 Evaluate: Answer: Copyright BobsMathClass.com All rights reserved 44

46 Procedure: Evaluating with a base of 10 Step 1: Step 2: Write the number one, and then insert an amount of zeros equal to the exponent. Perform any other operations and then starting from the right, place commas after every third digit. Example 6. Evaluate: Solution: Step 1 Answer: 700,000 Step 2 Your Turn Problem #6 Evaluate: Answer: Example 7. Evaluate: Solution: Step Answer: 36,000 Step 2 Your Turn Problem #7 Evaluate: Answer: Copyright BobsMathClass.com All rights reserved 46

51 1.8 Homework: Order of Operations Simplify the following Copyright BobsMathClass.com All rights reserved 51

53 1.9 Solving Equations Equation A sentence with an = (equal sign) is called an equation. Whole Number Operations Workbook Examples: = 12 ; 15 8 = 7. x + 5 =19, 3 N 51 An equation is a sentence. Using the example =12; = 12 translates to 9 and 3 is 12. The word and is a conjunction. 9 and 3 are the subjects. Is is the verb. 12 is the direct object. Solution An equation may be written with one or more of the numbers not known. A solution of an equation is a number that would make the sentence true if one of the numbers is not known. Example: 7 plus what number is 16? Using symbols: 7 + = 16 The solution to this equation would be 9 because = 16. Variable We usually use a letter instead of a blank box. The letter is called a variable. Example: 7 + N = 16 Solutions of an Equation The solution of an equation is a number which when replaced for the variable results in a true sentence. The left side of the equal sign is the same as the right side. Solving Equations We will begin to solve certain types of equations that are pertinent to the topics of this course. There may be occasions where mentally you can see what the answer is. That s good. However, try to follow a process if given. When the equations get more complicated, you will have practiced the process and the solution will be easier to find. Equations where the Variable is Isolated The first equation to consider is an equation where the variable is by itself on one side of the equal sign. The procedure is to perform the operation(s) on the other side of the equal sign. Copyright BobsMathClass.com All rights reserved 53

55 An equation is a balance. If you add a number to one side, then you must add the same number to the other side to keep the balance. Likewise, if you subtract a number on one side, you must subtract the same number on the other side. Therefore, if we subtract 5 on both sides, we will end up with just x on the left hand side and our 3 on the right hand side. Keep in mind, learning the proper procedures will make your transition to algebra courses much smoother. Procedure: To solve an equation of the form x + a = b 1. Subtract a on both sides 2. Simplify left hand side and the right hand side. Example 2a. Solve: x Solution: x Subtract 18 on both sides. x 0 6 (18 18 = 0 and = 6) Answer: x = 6 (x + 0 = x) Example 2b.Solve: x Solution: x Subtract 95 on both sides. x (95 95 = 0 and = 105) Answer: x = 105 (x + 0 = x) Note: Subtracting the number on the same line is a horizontal method. This process could also have been performed vertically. Choose the method you feel most comfortable with. Example 2c. Solve: x Solution: x Subtract 12 on both sides (12 12 = 0 and = 16) x 0 16 Answer: x = 16 Copyright BobsMathClass.com All rights reserved 55

56 Example 2d.Solve: 9 N 30 Solution: 9 N Subtract 9 on both sides. N (9 + N is the same as N + 9 ; Comm. Prop) N = 0 Answer: N = 21 Your Turn Problem #2 Solve the following equations. a) x b) x c) 28 A 54 a) Answer: b) Answer: c) Answer: Solving Equations of the form a x = b Let s look at an example in this form. 3 x = 24 3 times what number equals 24? The answer is 8. Remember, an equation is a balance. If you multiply a number to one side, then you must multiply the same number to the other side to keep the balance. Likewise, if you divide a number on one side, you must divide the same number on the other side. Therefore, if we divide 3 on both sides, we will end up with just x on the left hand side and our 8 on the right hand side. We are going to use a fraction notation to indicate division. We used this notation previously in the division section. Let s review. Copyright BobsMathClass.com All rights reserved 56

58 Example 4a. Solve: 3 x 24 Solution: 3 x 24 3 x 3 3 x Answer: x = 8 (1 x = x) Divide by 3on both sides. Simplify each side. Any number divided by itself equals 1. Example 4b. Solve: 7 x 238 Solution: 7 x x 7 7 x 7 Answer: x = Divide by 7 on both sides. Simplify each side. Any number divided by itself equals 1. Your Turn Problem #4 Solve the following equations. a) 9 x 432 b) 15 x 3045 a) Answer: b) Answer: Equations written backwards Some equations may be written with the variable on the right hand side of the = sign, Example: Solve 15 x 3 Our goal is still the same, we need to get x by itself. So always subtract the number next to x on each side. 15 x x x This can be written as x 12. Copyright BobsMathClass.com All rights reserved 58

59 Rewriting an equation so that the x is on the left hand side is a valid step given by the symmetric property. Symmetric Property: If b = a, then a = b The symmetric property lets us rewrite the equation with the x on the left hand side. This is an optional step. Some students find it easier to have x on the left hand side as soon as possible. If you wish to solve the equation without using the symmetric property, it will still work out fine. Example 5a. Solve: 45 x 7 Solution: x x 0 38 Answer: x = 38 Symmetric Property Subtract 7 on both sides. Example 5a. Solve: x Solution: 3 x x 3 3 x Answer: x = 75 Symmetric Property Divide by 3on both sides. Simplify each side. Any number divided by itself equals 1. Your Turn Problem #5 Solve the following equations. a) 71 x 39 b) x a) Answer: b) Answer: Copyright BobsMathClass.com All rights reserved 59

60 1.9 Homework: Solving Equations Solve the following equations 1. x x N N x a x x N Y x c x x A B Copyright BobsMathClass.com All rights reserved 60

61 1.9 Homework: Solving Equations cont. Solve the following equations x b x x C x x b N H 25. x x x x Copyright BobsMathClass.com All rights reserved 61

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