Related Addition and Subtraction Facts Worksheets for 1st Grade

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Grade 1MathAddition & SubtractionCCSS 1.OA.B.3CCSS 1.OA.C.6

Skill: Writing related addition and subtraction facts for the same three numbers

Preview of the Related Addition and Subtraction Facts printable worksheet
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Teaching tips and what to try next

Best for first graders who know most addition facts within 10 and are building subtraction. Cover one number in a set and ask what is missing, which mirrors how the four facts hang together. Smaller families are in Fact Families Within 10, and the triangle layout to 20 is in Fact Families Within 20.

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

Addition and subtraction are two sides of the same idea. If 6 + 7 = 13, then 13 take away 6 is 7, and 13 take away 7 is 6. First graders are expected to apply properties of operations and to add and subtract within 20, and seeing related facts together makes both goals easier.

The page has six sets of three numbers. For each set, children write two addition facts and two subtraction facts that use those numbers. The addends are from 2 to 10, and every sum stays within 20, so the facts stay in the fluency range. Because the same three numbers appear in every fact of a set, children can check one answer against another. Each of the ten versions has new number sets and its own answer key.

How to use it: build one set with counters first. Make a group of 5 and a group of 8, push them together, then pull one group away and ask what is left. On the sheet, suggest writing the two addition facts first, then flipping each one into a subtraction fact. If the four answers do not use the same three numbers, that is a quick signal to look again.

The answer key shows all four facts for every set. For the same idea with smaller numbers, try our Fact Families Within 10 worksheet. For the triangle layout with sums to 20, try our Fact Families Within 20 worksheet.