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Grade 1 · Math · On Level

Free Missing Addends Within 20 worksheet - version 10

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-1CNMB0C-JDC3

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

__ + 8 = 16

2.

__ + 3 = 20

3.

__ + 10 = 19

4.

__ + 7 = 19

5.

__ + 5 = 13

6.

__ + 7 = 20

7.

__ + 4 = 14

8.

__ + 10 = 18

9.

__ + 3 = 5

10.

__ + 4 = 10

11.

__ + 6 = 9

12.

__ + 5 = 20

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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 10
  1. __ + 8 = 168
  2. __ + 3 = 2017
  3. __ + 10 = 199
  4. __ + 7 = 1912
  5. __ + 5 = 138
  6. __ + 7 = 2013
  7. __ + 4 = 1410
  8. __ + 10 = 188
  9. __ + 3 = 52
  10. __ + 4 = 106
  11. __ + 6 = 93
  12. __ + 5 = 2015

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.