Lesson 7: Estimating Decimal Sums and Differences

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Presentation transcript:

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

Estimating Decimal Sums and Differences

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

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. 9.7 + 9.3 + 9.45 The total is about 28 points. 10 + 9 + 9 = 28

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. 9.7 + 9.7 + 9.45 The total is about 29 points. 10 + 10 + 9 = 29