1. Lesson 9.8: Multiplication of Decimals

3. Mental Math estimate the product and write the number model you used to solve it
Example: * 18
You write: 9 * 20 = 180
or * 18 = 180
11 * 42
28 * 49
22 * 76
63 * 63
98 * 59
72 * 414

4. Solve the problem at the top of MJ page 268
Math Message
Solve the problem at the top of MJ page 268

5. 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

6. 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?

7. Estimate the cost of 5 calculators
Multiply 5 * 929
Let’s use our estimate to place the decimal.

8. What are the steps to estimating the product of decimals?

9. Partnership Work MJ p 268

10. Math Journal page 269

11. What did we learn…