1. Lesson 7: Estimating Decimal Sums and Differences
Name: ___________________________________ Date: ____________
Module 1: DECIMALS
Lesson 7: Estimating Decimal Sums and Differences

2. Estimating Decimal Sums and Differences

3. Estimating Decimal Sums and Differences
Estimating before you add or subtract will help you check whether your answer is reasonable.
Helpful Hint

4. Estimating Decimal Sums and Differences
Example: Sports Application
What was Carly Patterson’s total for the events other than the floor exercise?
Estimate the sum of 9.7, 9.3, and 9.45.
Estimate by rounding to the nearest whole number.
The total is about 28 points.
= 28

5. Estimating Decimal Sums and Differences
Check It Out
What was Carly Patterson’s total for the events other than the vault exercise?
Estimate the sum of 9.7, 9.7, and 9.45.
Estimate by rounding to the nearest whole number.
The total is about 29 points.
= 29