Adding FractionsSame bottom number: add the tops, leave the bottom alone.4th GradeWhen the denominators match, add only thenumerators. The denominator names the size ofthe pieces and stays put.a/c + b/c = (a+b)/c3/8 + 2/85/8Three eighths and two more eighths is five eighths.5/6 + 4/69/6 = 1 1/2Going past 1 is fine. Simplify at the end.7/10 − 3/104/10 = 2/5Subtraction works exactly the same way.1/4 + 1/4 + 1/43/4Repeated adding is the same as 3 × 1/4.THE COMMON MISTAKE✗ 3/8 + 2/8 = 5/16✓ 3/8 + 2/8 = 5/8Adding the bottoms would change the size of the pieces, which nothing in the question did.Different bottoms? Make them match first, using equivalentfractions.Adding Fractionswww.littleactivity.com

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Math · 4th Grade

Adding Fractions

Same bottom number: add the tops, leave the bottom alone.

How to use it

Ask what the bottom number is naming. It is the size of the pieces, and that does not change.

Free · print-ready PDF · US Letter and A4

Grade
4th Grade
Ages
9–10
Subject
Math
Pages
1

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