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Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 16

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-15BBXRU-1OAJ

Free printable
1.__ + 2 = 18
2.__ + 7 = 12
3.__ + 2 = 5
4.__ + 1 = 12
5.__ + 3 = 20
6.__ + 8 = 17
7.__ + 9 = 17
8.__ + 0 = 20
9.__ + 0 = 7
10.__ + 15 = 20
11.__ + 7 = 20
12.__ + 1 = 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 16
  1. __ + 2 = 1816
  2. __ + 7 = 125
  3. __ + 2 = 53
  4. __ + 1 = 1211
  5. __ + 3 = 2017
  6. __ + 8 = 179
  7. __ + 9 = 178
  8. __ + 0 = 2020
  9. __ + 0 = 77
  10. __ + 15 = 205
  11. __ + 7 = 2013
  12. __ + 1 = 10

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.