MathematiCat

1st grade addition and subtraction within 20 worksheets

Your child adds and subtracts with numbers up to 20, including facts that cross ten like 8 + 5 and 14 − 6.

Common Core 1.OA.C.6 (Operations and Algebraic Thinking)

Sample problems

  1. Sample 117 − 5 = ?

    Answer: 12

  2. Sample 211 + 2 = ?

    Answer: 13

  3. A bit harder3 + 9 = ?

    Answer: 12

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Addition and subtraction within 20