PencilGo
Sign in

Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 19

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-11PH3R7-1OAJ

Free printable
1.__ + 1 = 20
2.__ + 4 = 15
3.__ + 0 = 20
4.__ + 0 = 19
5.__ + 16 = 20
6.__ + 10 = 20
7.__ + 8 = 20
8.__ + 7 = 20
9.__ + 13 = 13
10.__ + 6 = 8
11.__ + 2 = 9
12.__ + 14 = 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 19
  1. __ + 1 = 2019
  2. __ + 4 = 1511
  3. __ + 0 = 2020
  4. __ + 0 = 1919
  5. __ + 16 = 204
  6. __ + 10 = 2010
  7. __ + 8 = 2012
  8. __ + 7 = 2013
  9. __ + 13 = 130
  10. __ + 6 = 82
  11. __ + 2 = 97
  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.