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Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 3

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-TT1YHA-1OAJ

1.

__ + 10 = 20

2.

__ + 9 = 12

3.

__ + 15 = 19

4.

__ + 6 = 20

5.

__ + 2 = 2

6.

__ + 0 = 20

7.

__ + 1 = 20

8.

__ + 2 = 19

9.

__ + 4 = 13

10.

__ + 0 = 8

11.

__ + 15 = 16

12.

__ + 10 = 15

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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 3
  1. __ + 10 = 2010
  2. __ + 9 = 123
  3. __ + 15 = 194
  4. __ + 6 = 2014
  5. __ + 2 = 20
  6. __ + 0 = 2020
  7. __ + 1 = 2019
  8. __ + 2 = 1917
  9. __ + 4 = 139
  10. __ + 0 = 88
  11. __ + 15 = 161
  12. __ + 10 = 155

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.