Adding and Subtracting Mixed Numbers Worksheets for 4th Grade

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Grade 4MathFractionsCCSS 4.NF.B.3.c

Skill: Adding and subtracting mixed numbers with like denominators

Preview of the Adding and Subtracting Mixed Numbers printable worksheet
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Teaching tips and what to try next

Children can add the whole numbers and fractions separately, but subtraction sometimes needs a whole traded for fractional parts (3 1/4 - 1 3/4). Practice that trade with drawings first. Review Improper Fractions and Mixed Numbers; for unlike denominators, go on to Adding Fractions With Unlike Denominators.

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).

Download all 10 versions (one PDF)All 10 answer keys (PDF)

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About this worksheet

Mixed numbers, such as 3 1/4, combine a whole number and a fraction. In fourth grade, students add and subtract mixed numbers that have the same denominator. This fourth-grade worksheet gives twelve problems, six sums and six differences, with denominators from 3 to 12.

Half of the problems are straightforward: add or subtract the fractions, then add or subtract the whole numbers. The other half need regrouping. In some sums, the fractions add up to one whole or more, such as 3 7/8 + 4 3/8, so students trade eight eighths for 1 and add it to the whole numbers. In some differences, the top fraction is smaller than the bottom one, such as 5 1/5 - 3 4/5, so students borrow 1 from the whole number and rename it as fifths. Every fraction on the sheet is in simplest form, and the problems are mixed so students must decide each time whether to regroup.

How to use it: have students estimate first by looking at the whole numbers. An answer for 7 1/6 - 3 5/6 should be a little more than 3. For regrouping, students can also change both mixed numbers to improper fractions, subtract, and change back, which is the method named in the standard. Fraction strips or a number line help students see why 1 whole equals 6/6. When the answer can be simplified, the key shows both forms, such as 6 4/10 = 6 2/5.

The answer key lists every answer. This worksheet supports Common Core standard 4.NF.B.3.c. Review the basics with our Improper Fractions and Mixed Numbers worksheet.