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Grade 1 · Math · On Level

Free Missing Addends Within 20 worksheet - version 13

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-1DHL439-JDC3

Four children and a teacher collaborate with blocks, patterns, and a notebook.
1.

__ + 0 = 20

2.

__ + 4 = 17

3.

__ + 8 = 20

4.

__ + 2 = 8

5.

__ + 2 = 9

6.

__ + 5 = 6

7.

__ + 6 = 18

8.

__ + 4 = 18

9.

__ + 0 = 16

10.

__ + 4 = 7

11.

__ + 1 = 20

12.

__ + 5 = 7

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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 13
  1. __ + 0 = 2020
  2. __ + 4 = 1713
  3. __ + 8 = 2012
  4. __ + 2 = 86
  5. __ + 2 = 97
  6. __ + 5 = 61
  7. __ + 6 = 1812
  8. __ + 4 = 1814
  9. __ + 0 = 1616
  10. __ + 4 = 73
  11. __ + 1 = 2019
  12. __ + 5 = 72

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.