Adding and Subtracting Fractions With Like Denominators

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Grade 4MathFractionsCCSS 4.NF.B.3.aCCSS 4.NF.B.3.d

Skill: Adding and subtracting fractions that have the same denominator

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10 versions, each with its own answer key

Same skill and layout, a fresh set of problems in every version, so children can keep practicing without repeating a page. Problems are not repeated between versions unless a skill has only a small number of possible problems (for example, the addition facts within 10).

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About this worksheet

When two fractions have the same denominator, they are counting the same size pieces. Adding 2/8 and 3/8 is like adding two eighths and three eighths, which makes five eighths, or 5/8. This fourth-grade worksheet gives eighteen problems: nine additions and nine subtractions with like denominators from 3 to 12. Students add or subtract the numerators and keep the denominator.

Every sum is less than one whole, and every difference is more than zero, so students can focus on the main idea without converting to mixed numbers. Answers are written with the same denominator as the problem, so 2/4 stays 2/4. Ready students can name the simplest form as a challenge.

How to use it: the most common mistake is adding the denominators too, such as writing 2/8 + 3/8 = 5/16. Draw a bar cut into eighths and shade two pieces and then three more pieces. The pieces are still eighths, so the denominator stays 8. For subtraction, shade the first fraction and cross out the pieces being taken away.

The answer key lists every answer. This worksheet supports Common Core standards 4.NF.B.3.a (understand addition and subtraction of fractions as joining and separating parts referring to the same whole) and 4.NF.B.3.d (solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators). Use our Simplifying Fractions worksheet next, and our Adding Unlike Fractions worksheet when students move on to different denominators.