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Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 2

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-U31K69-1OAJ

Free printable
1.__ + 13 = 17
2.__ + 9 = 20
3.__ + 0 = 20
4.__ + 12 = 12
5.__ + 14 = 19
6.__ + 6 = 9
7.__ + 9 = 19
8.__ + 13 = 20
9.__ + 8 = 12
10.__ + 16 = 20
11.__ + 12 = 20
12.__ + 0 = 1
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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 2
  1. __ + 13 = 174
  2. __ + 9 = 2011
  3. __ + 0 = 2020
  4. __ + 12 = 120
  5. __ + 14 = 195
  6. __ + 6 = 93
  7. __ + 9 = 1910
  8. __ + 13 = 207
  9. __ + 8 = 124
  10. __ + 16 = 204
  11. __ + 12 = 208
  12. __ + 0 = 11

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.