1. Unit 4 Lesson 10
Estimate Products
Use Rounding to Estimate Products

2. Help Eli out!
Approximately how many yards did Peyton pass for in the last two seasons?

3. Round 42 to the nearest ten. Which ten is closer to 42?
Round 762 to the nearest hundred. Which hundred is closer to 762?
Round 0.86 to the nearest tenth. Which tenth is closer to 0.86?
Round to the nearest hundredth. Which hundredth is closer to ?

4. Round to the nearest ten46 85
928

5. Round to the nearest hundred
231
459
350

6. Round to the nearest tenth
0.73
0.15
0.483

7. Round to the nearest hundredth
0.532
0.609
0.165

8. What is the greatest number that can be rounded to 30?
What is the least?
What is the greatest decimal in hundredths that can be rounded to 14.5?
What is the least?

9. For the next few problems, round the factors and multiply mentally to find the estimated answer.
Then find the exact answer.

10. Estimate: 24 x 39 =
Exact: 24 x 39 =
Estimate: 151 x 32 =
Exact: 151 x 32 =

11. Estimate: 0.74 x 0.2 =
Exact: 0.74 x 0.2 =
Estimate: 12.3 x 3.7 =
Exact: 12.3 x 3.7 =

12. Is there more than one way to round these numbers?
Why are some exact numbers closer to the estimated answer than others?

13. Tanya did these multiplications on her calculator.
Which answers are clearly wrong?