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Grade 1 · Math · On Level

Free Missing Addends Within 20 worksheet - version 2

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-1NL6HWD-JDC3

1.

__ + 1 = 20

2.

__ + 18 = 20

3.

__ + 20 = 20

4.

__ + 5 = 9

5.

__ + 8 = 11

6.

__ + 3 = 17

7.

__ + 17 = 20

8.

__ + 4 = 5

9.

__ + 6 = 15

10.

__ + 1 = 14

11.

__ + 16 = 20

12.

__ + 2 = 18

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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 2
  1. __ + 1 = 2019
  2. __ + 18 = 202
  3. __ + 20 = 200
  4. __ + 5 = 94
  5. __ + 8 = 113
  6. __ + 3 = 1714
  7. __ + 17 = 203
  8. __ + 4 = 51
  9. __ + 6 = 159
  10. __ + 1 = 1413
  11. __ + 16 = 204
  12. __ + 2 = 1816

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.