PencilGoPencilGo

Grade 1 · Math · Building Confidence

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.

Download free PDF

Missing Addends Within 20

Grade 1 · Building confidence · 12 questions · Version PG-UC0CHR-RBT8

1.

__ + 4 = 20

2.

__ + 2 = 20

3.

__ + 0 = 20

4.

__ + 8 = 20

5.

__ + 11 = 20

6.

__ + 1 = 20

7.

__ + 18 = 20

8.

__ + 0 = 6

9.

__ + 5 = 13

10.

__ + 10 = 20

11.

__ + 4 = 16

12.

__ + 5 = 11

Worksheet PDFAnswer keyCustomize

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. __ + 4 = 2016
  2. __ + 2 = 2018
  3. __ + 0 = 2020
  4. __ + 8 = 2012
  5. __ + 11 = 209
  6. __ + 1 = 2019
  7. __ + 18 = 202
  8. __ + 0 = 66
  9. __ + 5 = 138
  10. __ + 10 = 2010
  11. __ + 4 = 1612
  12. __ + 5 = 116

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.