Estimating Sums and Differences

Estimating Sums and Differences

Estimating Sums and Differences Lesson 4-1 Benchmark Numbers A benchmark is a number that is easy to use when you estimate. When estimating the sums and differences of fractions, we use the benchmarks 0, , and 1. (chart on page 171 of book)

Change each fraction to 0, , or 1. Add or subtract. 5 + 3 25 11

+ 0 = Example 2 7 + 4 9 15

+ = 1

Estimating Mixed Numbers If you have mixed numbers, then round the fraction part up to 1 or down to 0. If the fraction is greater than , then round up to 1. If it is less than , then round down to 0. Example

15 3 4 16 10 10

1 8 =6 Homework Time

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