Estimating Fraction Sums & Differences Textbook page 236 IAN page 68

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)

Example: Estimate each sum or difference (A)8/9 + 2/ (B) 7/12 – 8/15 ½ - ½ 0