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Growing fluency worksheet

Addition within 20

Practice addition with sums up to 20. Get printable worksheets with answers, a worked example and a customizable generator. Use the reviewed worksheet as-is, or customize a fresh set below.

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Worksheet · LetterWorksheet · A4
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This set includes 0 and one- or two-digit addends, such as 13 + 6, with every sum capped at 20.

12 problems · 1 student page · optional separate answer page

US Letter

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A4

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Learning objective

What this practice builds

Find sums to 20 using known facts, counting on, and making a ten.

8 + 7=15

Worked example

Show the thinking, not only the answer

Move 2 from the 7 to complete a ten, then add what remains.

  1. Make 10Split 7 into 2 and 5. Then 8 + 2 = 10.
  2. Add the restAdd the remaining 5: 10 + 5 = 15.
  3. RecordWrite 8 + 7 = 15 and explain where the 5 came from.

Teaching support

Common mistakes and useful responses

Losing part of an addend

Keep both parts of the decomposed number visible: 7 becomes 2 and 5, and both parts must be used.

Using make-ten for every fact

Accept a known fact immediately. The strategy is a support for unfamiliar facts, not an extra required step.

Suggested sequence

Use the worksheet with purpose

  1. 1

    Warm up with tens

    Review several partners of 10 before introducing a near-ten sum.

  2. 2

    Model the move

    Use a ten-frame or counters to show part of one addend moving to fill the ten.

  3. 3

    Fade the model

    Move from objects to a quick number bond, then to a mental explanation.

Teaching guide

Plan the lesson around this skill

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Addition within 20

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12 problems · US Letter
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Name: Score: / 12Teacher: Date:

Addition within 20

Add each pair. Every sum is 20 or less. 1 mark each.

  1. 1.
    6+  13
  2. 2.
    2+  6
  3. 3.
    18+  2
  4. 4.
    9+  4
  5. 5.
    8+  8
  6. 6.
    2+  9
  7. 7.
    10+  0
  8. 8.
    12+  0
  9. 9.
    15+  1
  10. 10.
    2+  16
  11. 11.
    16+  4
  12. 12.
    7+  12
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