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PRE-ALGEBRALesson 56 of 171

ADDITION AND SUBTRACTION

Estimating Sums and Differences

Students learn to estimate the sum or difference of two decimals by first rounding each decimal to the nearest whole number, then adding or subtracting. For example, to estimate the sum of 4.94 and 2.185, round 4.94 up to 5, and round 2.185 down to 2, to get 5 + 2, which equals 7.

### Elementary / Middle

High School Math

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College Math

*Also referred to as Elementary Algebra or Beginning Algebra.

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