By E.T. Copson

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19 Writing in Math Explain the meaning of the equal sign (=). Name the operation needed to solve the problem. Write a number sentence to solve the problem. Answer the question. 20 ADVERTISING Mrs. Rodriguez paid for 3 newspaper ads. Each ad ran for the same number of days. How many days did each ad appear if she was charged for a total of 30 days? (Lesson 1-2, p. 11) 21 POPULATION Last year 540 people lived in Nelsonville. This year 610 people live there. How many more people live in Nelsonville this year than last year?

Check your answer. 19 7+6= +7 20 39 + 28 = 28 + = 13 21 67 = 5×9=9× 22 18 × 5 = 45 = 23 × 18 = 90 48 + 37 = + + 24 = 15 + 11 = = · 25 =7·6 26 9·8= = 27 5+ · = = 26 + + 44 = 28 31 = 29 8· = = 99 ·8 30 32 = 31 2· + 55 5· =9· 45 = = ·2 32 · 18 = = 54 ·3 = 54 Copyright © by The McGraw-Hill Companies, Inc. Solve. 33 HOBBIES Sarah has 5 bags of marbles with 10 marbles in each bag. Noah has 10 bags of marbles with 5 marbles in each bag. Compare the number of marbles. Justify your answer. 34 GAMES Felipe had 14 game cards.

54 Chapter 2 Math Fundamentals Copyright © by The McGraw-Hill Companies, Inc. Solve. Justify your answer. 30 NUMBERS If you know that 3 + (5 + 4) = 12, then what is the sum of (3 + 5) + 4? 31 NUMBERS If you know that 2 × (6 × 11) = 132, what is the product of (2 × 6) × 11? Vocabulary Check sentence. Write the vocabulary word that completes each 32 The Associative Property of states that the grouping of the factors does not change the product. 33 The Associative Property of states that the grouping of the addends does not change the sum.