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Lesson 9.8: Multiplication of Decimals. Mental Math estimate the product and write the number model you used to solve it. Example: 9 * 18 You write: 9 * 20 = 180 or 10 * 18 = 180. 11 * 42. 28 * 49. 22 * 76. 63 * 63. 98 * 59. 72 * 414. Math Message.
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Mental Mathestimate the product and write the number model you used to solve it Example: 9 * 18 You write: 9 * 20 = 180 or 10 * 18 = 180 11 * 42 28 * 49 22 * 76 63 * 63 98 * 59 72 * 414
Math Message Solve the problem at the top of MJ page 268
Estimating Products of Decimals We will learn to find the product of decimals On your slate, estimate each product. Show your work. 11 * 2.8 110 * 2.8 11 * 0.28
Which problem is most likely to have the product 30.8? How do you know? 110 * 2.8 11 * 0.28 11 * 2.8 110 * 2.8 = 308 Where would you place the decimal point? How do you know? 11 * 0.28 = 308 Where would you place the decimal point? How do you know?
Estimate the cost of 5 calculators Multiply 5 * 929 Let’s use our estimate to place the decimal.
