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Rounding Fractions and Mixed Numbers

Lesson 5 -1:. Rounding Fractions and Mixed Numbers. 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, ½, and 1. (another chart on page 249 in textbook).

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Rounding Fractions and Mixed Numbers

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  1. Lesson 5 -1: Rounding Fractions and Mixed Numbers

  2. 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, ½, and 1. (another chart on page 249 in textbook)

  3. Change each fraction to 0, ½, or 1. Add or subtract. 3 5 + 25 11 ½ ½ + 0 =

  4. Example 2 7 4 + 9 15 ½ ½ = 1 +

  5. 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. Estimating Mixed Numbers

  6. Example 15 3 10 1 4 8 10 6 16 =

  7. When doing your homework practice Be sure to have textbook open to P 249-250 for help!!!!

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