PencilGoPencilGo

Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 12

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 · Stretch challenge · 12 questions · Version PG-147DIZY-1OAJ

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

__ + 1 = 4

2.

__ + 6 = 16

3.

__ + 12 = 20

4.

__ + 2 = 20

5.

__ + 0 = 20

6.

__ + 11 = 14

7.

__ + 3 = 20

8.

__ + 1 = 17

9.

__ + 17 = 20

10.

__ + 3 = 10

11.

__ + 9 = 20

12.

__ + 4 = 20

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 12
  1. __ + 1 = 43
  2. __ + 6 = 1610
  3. __ + 12 = 208
  4. __ + 2 = 2018
  5. __ + 0 = 2020
  6. __ + 11 = 143
  7. __ + 3 = 2017
  8. __ + 1 = 1716
  9. __ + 17 = 203
  10. __ + 3 = 107
  11. __ + 9 = 2011
  12. __ + 4 = 2016

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.