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Grade 1 · Math · Building Confidence

Free Missing Addends Within 20 worksheet - version 6

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-HCFRXV-RBT8

1.

__ + 9 = 20

2.

__ + 9 = 15

3.

__ + 2 = 20

4.

__ + 10 = 20

5.

__ + 1 = 8

6.

__ + 0 = 8

7.

__ + 8 = 20

8.

__ + 5 = 18

9.

__ + 16 = 20

10.

__ + 1 = 10

11.

__ + 5 = 20

12.

__ + 0 = 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 6
  1. __ + 9 = 2011
  2. __ + 9 = 156
  3. __ + 2 = 2018
  4. __ + 10 = 2010
  5. __ + 1 = 87
  6. __ + 0 = 88
  7. __ + 8 = 2012
  8. __ + 5 = 1813
  9. __ + 16 = 204
  10. __ + 1 = 109
  11. __ + 5 = 2015
  12. __ + 0 = 2020

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.