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Rounding Fractions: Estimating Sums and Differences

This educational text addresses the essential concepts of rounding fractions for estimating sums and differences. It explains when to round fractions to 0, ½, or 1 based on the relationship between the numerator and denominator. Specific examples illustrate the rounding rules: fractions where the numerator is much less than half the denominator round to 0, those about half round to ½, and fractions close to equality round to 1. Practice problems encourage learners to apply these rounding techniques to estimate results effectively.

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Rounding Fractions: Estimating Sums and Differences

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  1. Estimating Fraction Sums & Differences Textbook page 236 IAN page 68

  2. What amounts do we round fractions to?When do we round fractions to 0?When do we round fractions to ½? When do we round fractions to 1? We round fractions to: 0, ½, or 1 If the numerator is a lot les than half the denominator, we round to 0. (ex: 1/5, 2/11, 4/15) If the numerator is about half of the denominator we round to ½. (ex: 5/11, 4/7, 9/20) If the numerator and the denominator are about the same number we round to 1. (ex: 9/10, 16/19, 6/7)

  3. Example:Estimate each sum or difference • 8/9 + 2/11 1 + 0 1 (B) 7/12 – 8/15 ½ - ½ 0

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