Fact Families Within 10 Worksheets for 1st Grade

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Grade 1MathAddition & SubtractionCCSS 1.OA.B.4CCSS 1.OA.C.6

Skill: Writing two addition and two subtraction facts for three related numbers within 10

Preview of the Fact Families Within 10 printable worksheet
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Teaching tips and what to try next

Fits first graders who know most addition facts within 10 and are starting to subtract. A paper triangle with the total at the top lets your child cover one corner and say the fact that finds the hidden number. When these feel easy, try Fact Families Within 20 with totals up to 20, or practice finding a missing part with Missing Addends Within 10.

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

A fact family is a set of three numbers that belong together, such as 3, 5 and 8. The same three numbers make two addition facts and two subtraction facts. Seeing this link helps first graders use an addition fact they know to solve a subtraction fact they are still learning. This first-grade worksheet practices fact families with small numbers, all within 10.

The page has six triangles. The total sits at the top of each triangle, and the two parts sit at the bottom corners. Below each triangle are four lines, and children write two addition facts and two subtraction facts using the three numbers. Every family uses two different parts, from 1 to 9, and a total from 3 to 10, so the numbers stay friendly while children focus on how the facts are connected. Each of the ten versions has new families and its own answer key.

How to use it: make one fact family with real objects before the worksheet. Put 4 blocks of one color and 2 of another in a row, and say both addition facts. Then cover the 2 blocks and ask how many are left, which shows the subtraction fact. A common slip is to start a subtraction fact with a part instead of the total, writing 2 take away 6. Remind your child that subtraction facts in a family always start with the biggest number, the one at the top.

The answer key lists all four facts for each family. For bigger numbers, try our Fact Families Within 20 worksheet. To find a missing part, try our Missing Addends Within 10 worksheet.