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Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 10

Find the missing part in addition equations through 20. This printable version includes 12 grade-appropriate questions and a separate answer sheet.

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Missing Addends Within 20

Grade 1 · Stretch challenge · 12 questions · Version PG-13NEBM0-1OAJ

Free printable
1.__ + 5 = 12
2.__ + 3 = 18
3.__ + 5 = 5
4.__ + 13 = 16
5.__ + 8 = 20
6.__ + 8 = 18
7.__ + 0 = 20
8.__ + 1 = 2
9.__ + 14 = 18
10.__ + 9 = 13
11.__ + 15 = 18
12.__ + 16 = 20
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Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 10
  1. __ + 5 = 127
  2. __ + 3 = 1815
  3. __ + 5 = 50
  4. __ + 13 = 163
  5. __ + 8 = 2012
  6. __ + 8 = 1810
  7. __ + 0 = 2020
  8. __ + 1 = 21
  9. __ + 14 = 184
  10. __ + 9 = 134
  11. __ + 15 = 183
  12. __ + 16 = 204

Worked example

__ + 6 = 14. Think 14 - 6, so the missing addend is 8.

Common mistake

Adding the known addend and total together.

Helpful hint

Subtract the known part from the total.