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Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 11

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-13XDXAZ-1OAJ

Free printable
1.__ + 20 = 20
2.__ + 2 = 20
3.__ + 1 = 20
4.__ + 5 = 17
5.__ + 5 = 20
6.__ + 4 = 5
7.__ + 1 = 11
8.__ + 12 = 20
9.__ + 2 = 10
10.__ + 0 = 14
11.__ + 10 = 15
12.__ + 3 = 3
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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 11
  1. __ + 20 = 200
  2. __ + 2 = 2018
  3. __ + 1 = 2019
  4. __ + 5 = 1712
  5. __ + 5 = 2015
  6. __ + 4 = 51
  7. __ + 1 = 1110
  8. __ + 12 = 208
  9. __ + 2 = 108
  10. __ + 0 = 1414
  11. __ + 10 = 155
  12. __ + 3 = 30

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.