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Grade 1 · Math · Challenge

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 · Stretch challenge · 12 questions · Version PG-RB5J8J-1OAJ

1.

__ + 10 = 20

2.

__ + 7 = 19

3.

__ + 5 = 20

4.

__ + 0 = 5

5.

__ + 3 = 20

6.

__ + 12 = 16

7.

__ + 7 = 20

8.

__ + 10 = 12

9.

__ + 17 = 20

10.

__ + 3 = 17

11.

__ + 5 = 17

12.

__ + 0 = 16

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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 = 2010
  2. __ + 7 = 1912
  3. __ + 5 = 2015
  4. __ + 0 = 55
  5. __ + 3 = 2017
  6. __ + 12 = 164
  7. __ + 7 = 2013
  8. __ + 10 = 122
  9. __ + 17 = 203
  10. __ + 3 = 1714
  11. __ + 5 = 1712
  12. __ + 0 = 1616

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.