Fact Families Within 100 Worksheets for 2nd Grade

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Grade 2MathAddition & SubtractionCCSS 2.NBT.B.5

Skill: Writing related addition and subtraction facts for two-digit numbers within 100

Preview of the Fact Families Within 100 printable worksheet
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Teaching tips and what to try next

Designed for second graders who add and subtract two-digit numbers and know fact families with smaller totals from Fact Families Within 20. Writing the three numbers on sticky notes and moving them into each spot of the four facts helps children see that only the order changes. Build on this with Missing Addends Within 100 or regroup on paper in Two-Digit Subtraction With Regrouping.

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

Second graders add and subtract two-digit numbers, and fact families show how those two skills fit together. If a child knows that 27 + 45 = 72, then 72 – 45 and 72 – 27 can be answered without starting over. This second-grade worksheet uses fact family triangles with two-digit numbers to practice that link.

The page has six triangles. The total is at the top of each one, and the two parts are at the bottom corners. Children write two addition facts and two subtraction facts for each family on the four lines below. Both parts are two-digit numbers from 10 to 89, and the totals range from 30 to 99. Checking a fact sometimes needs regrouping, so children practice careful two-digit thinking. Each of the ten versions has new families and its own answer key.

How to use it: start with a family your child can check easily, such as 20, 30 and 50, and say all four facts aloud together. Then move to the triangles on the page. Encourage your child to check one fact before writing the rest, for example by adding the two parts in their head or with a quick sketch of tens and ones. Watch for subtraction facts written backward, such as starting with a part instead of the total. A good habit is to ask, "Which number is the whole?" before writing each subtraction fact.

The answer key lists all four facts for every family. For smaller numbers, try our Fact Families Within 20 worksheet. For more two-digit practice, try our Missing Addends Within 100 worksheet.