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Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 15

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-151CC2V-1OAJ

Free printable
1.__ + 10 = 14
2.__ + 4 = 20
3.__ + 10 = 15
4.__ + 12 = 20
5.__ + 13 = 16
6.__ + 3 = 20
7.__ + 12 = 16
8.__ + 2 = 19
9.__ + 2 = 12
10.__ + 10 = 20
11.__ + 9 = 20
12.__ + 15 = 19
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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 15
  1. __ + 10 = 144
  2. __ + 4 = 2016
  3. __ + 10 = 155
  4. __ + 12 = 208
  5. __ + 13 = 163
  6. __ + 3 = 2017
  7. __ + 12 = 164
  8. __ + 2 = 1917
  9. __ + 2 = 1210
  10. __ + 10 = 2010
  11. __ + 9 = 2011
  12. __ + 15 = 194

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.