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Grade 1 · Math · Building Confidence

Free Missing Addends Within 20 worksheet - version 17

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 · Building confidence · 12 questions · Version PG-UC0CHR-RBT8

Free printable
1.__ + 4 = 20
2.__ + 2 = 20
3.__ + 0 = 20
4.__ + 8 = 20
5.__ + 11 = 20
6.__ + 1 = 20
7.__ + 18 = 20
8.__ + 0 = 6
9.__ + 5 = 13
10.__ + 10 = 20
11.__ + 4 = 16
12.__ + 5 = 11
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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 17
  1. __ + 4 = 2016
  2. __ + 2 = 2018
  3. __ + 0 = 2020
  4. __ + 8 = 2012
  5. __ + 11 = 209
  6. __ + 1 = 2019
  7. __ + 18 = 202
  8. __ + 0 = 66
  9. __ + 5 = 138
  10. __ + 10 = 2010
  11. __ + 4 = 1612
  12. __ + 5 = 116

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.