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Grade 1 · Math · Building Confidence

Free Missing Addends Within 20 worksheet - version 18

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-VPYCYM-RBT8

1.

__ + 1 = 20

2.

__ + 18 = 20

3.

__ + 1 = 9

4.

__ + 3 = 7

5.

__ + 1 = 12

6.

__ + 14 = 18

7.

__ + 15 = 20

8.

__ + 14 = 14

9.

__ + 2 = 20

10.

__ + 8 = 13

11.

__ + 0 = 8

12.

__ + 7 = 14

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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 18
  1. __ + 1 = 2019
  2. __ + 18 = 202
  3. __ + 1 = 98
  4. __ + 3 = 74
  5. __ + 1 = 1211
  6. __ + 14 = 184
  7. __ + 15 = 205
  8. __ + 14 = 140
  9. __ + 2 = 2018
  10. __ + 8 = 135
  11. __ + 0 = 88
  12. __ + 7 = 147

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.