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Grade 1 · Math · On Level

Free Missing Addends Within 20 worksheet - version 8

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 · On-level practice · 12 questions · Version PG-1KTAGYN-JDC3

Free printable
1.__ + 10 = 10
2.__ + 15 = 18
3.__ + 6 = 13
4.__ + 1 = 1
5.__ + 2 = 20
6.__ + 15 = 20
7.__ + 3 = 12
8.__ + 1 = 11
9.__ + 13 = 16
10.__ + 3 = 20
11.__ + 9 = 15
12.__ + 2 = 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 8
  1. __ + 10 = 100
  2. __ + 15 = 183
  3. __ + 6 = 137
  4. __ + 1 = 10
  5. __ + 2 = 2018
  6. __ + 15 = 205
  7. __ + 3 = 129
  8. __ + 1 = 1110
  9. __ + 13 = 163
  10. __ + 3 = 2017
  11. __ + 9 = 156
  12. __ + 2 = 31

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.