By Holt Mcdougal

ISBN-10: 0618656057

ISBN-13: 9780618656059

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Try This as a Class a. Estimate 76  43 by rounding both factors to the nearest ten before multiplying. b. Is it hard to tell whether your estimate from part (a) is greater than or less than the exact product? Explain. checks that you know how to use rounding to estimate products. GOAL LEARN HOW TO... U U use compatible numbers for mental math decide when to use mental math, paper and pencil, or a calculator AS YOU... U take part in The Great Arithmetic Race KEY TERM U compatible numbers .

7 8 9 10 Describe the order in which the operations are performed to get the answers shown. a. 3  6 2 5 = 13 b. 20 2 6  2 = 8 c. 30 4 10 + 5 = 8 d. 15 2 4  3 + 6 = 9 How do parentheses affect the order in which operations are performed? ) a. 3  (6 2 5) = 3 b. (20 2 6)  2 = 28 c. 30 4 (10 + 5) = 2 d. (15 2 4)  3 + 6 = 39 Try This as a Class Use your results from Questions 5–8. Describe the order of operations in a way that is clear and easy to remember. For each problem, write an expression that uses both addition and multiplication and can be used to solve the problem.

Use the equation to predict the 90th term of the sequence. SAMPLE RESPONSE Because the terms and the term numbers change, you can use variables to represent them. Let t = the term. Let n = the term number. The term is equal to 2 times the term number. or t = 2 n t = 2n “2 times n” can be written 2  n or 2n. Use this equation to predict the 90th term of the sequence. Evaluate the expression 2  n when n = 90. t = 2 n = 2  90 = 180 . . . . . . . . . . . . . . . . . . . . .

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Math Them 08 Pe by Holt Mcdougal


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