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Grade 1 · Math · On Level

Free Missing Addends Within 20 worksheet - version 8

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-1KTAGYN-JDC3

1.

__ + 10 = 10

2.

__ + 15 = 18

3.

__ + 6 = 13

4.

__ + 1 = 1

5.

__ + 2 = 20

6.

__ + 15 = 20

7.

__ + 3 = 12

8.

__ + 1 = 11

9.

__ + 13 = 16

10.

__ + 3 = 20

11.

__ + 9 = 15

12.

__ + 2 = 3

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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 8
  1. __ + 10 = 100
  2. __ + 15 = 183
  3. __ + 6 = 137
  4. __ + 1 = 10
  5. __ + 2 = 2018
  6. __ + 15 = 205
  7. __ + 3 = 129
  8. __ + 1 = 1110
  9. __ + 13 = 163
  10. __ + 3 = 2017
  11. __ + 9 = 156
  12. __ + 2 = 31

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.