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Grade 1 · Math · On Level

Free Missing Addends Within 20 worksheet - version 1

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-1MR7OTG-JDC3

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

__ + 15 = 18

2.

__ + 18 = 18

3.

__ + 7 = 9

4.

__ + 7 = 18

5.

__ + 11 = 11

6.

__ + 5 = 20

7.

__ + 17 = 18

8.

__ + 4 = 5

9.

__ + 14 = 15

10.

__ + 9 = 20

11.

__ + 2 = 20

12.

__ + 14 = 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 1
  1. __ + 15 = 183
  2. __ + 18 = 180
  3. __ + 7 = 92
  4. __ + 7 = 1811
  5. __ + 11 = 110
  6. __ + 5 = 2015
  7. __ + 17 = 181
  8. __ + 4 = 51
  9. __ + 14 = 151
  10. __ + 9 = 2011
  11. __ + 2 = 2018
  12. __ + 14 = 206

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.