Lesson 9.8: Multiplication of Decimals

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Presentation transcript:

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

Solve the problem at the top of MJ page 268 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

110 * 2.8 11 * 0.28 11 * 2.8 Which problem is most likely to have the product 30.8? How do you know? 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.

What are the steps to estimating the product of decimals?

Partnership Work MJ p 268

Math Journal page 269

What did we learn…