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Published byLambert Norton
Modified over 6 years ago
Lesson 5 -1:
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, ½, and 1. (another chart on page 249 in textbook)
Change each fraction to 0, ½, or 1. Add or subtract. 5 11 + 3 25 + ½ 0= ½
+ 7 15 4 9 + ½ ½ = 1
If you have mixed numbers, then round the fraction part up to 1 or down to 0. If the fraction is greater than ½, then round up to 1. If it is less than ½, then round down to 0.
3 4 1510 1 8 16 10 = 6
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