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Grade 1 · Math · Building Confidence

Free Missing Addends Within 20 worksheet - version 9

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-KYALYI-RBT8

Free printable
1.__ + 0 = 20
2.__ + 12 = 15
3.__ + 1 = 5
4.__ + 10 = 20
5.__ + 5 = 20
6.__ + 14 = 16
7.__ + 8 = 9
8.__ + 13 = 20
9.__ + 6 = 20
10.__ + 11 = 20
11.__ + 16 = 19
12.__ + 15 = 20
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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 9
  1. __ + 0 = 2020
  2. __ + 12 = 153
  3. __ + 1 = 54
  4. __ + 10 = 2010
  5. __ + 5 = 2015
  6. __ + 14 = 162
  7. __ + 8 = 91
  8. __ + 13 = 207
  9. __ + 6 = 2014
  10. __ + 11 = 209
  11. __ + 16 = 193
  12. __ + 15 = 205

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.