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Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 17

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-15LBJGT-1OAJ

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

__ + 0 = 10

2.

__ + 17 = 20

3.

__ + 10 = 20

4.

__ + 20 = 20

5.

__ + 18 = 20

6.

__ + 7 = 20

7.

__ + 0 = 9

8.

__ + 0 = 20

9.

__ + 5 = 20

10.

__ + 5 = 11

11.

__ + 8 = 8

12.

__ + 0 = 6

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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 17
  1. __ + 0 = 1010
  2. __ + 17 = 203
  3. __ + 10 = 2010
  4. __ + 20 = 200
  5. __ + 18 = 202
  6. __ + 7 = 2013
  7. __ + 0 = 99
  8. __ + 0 = 2020
  9. __ + 5 = 2015
  10. __ + 5 = 116
  11. __ + 8 = 80
  12. __ + 0 = 66

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.