PencilGo
Sign in

Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 18

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-11FHI28-1OAJ

Free printable
1.__ + 3 = 8
2.__ + 13 = 20
3.__ + 7 = 13
4.__ + 12 = 18
5.__ + 8 = 20
6.__ + 9 = 20
7.__ + 6 = 14
8.__ + 6 = 20
9.__ + 7 = 20
10.__ + 9 = 17
11.__ + 1 = 20
12.__ + 8 = 12
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 18
  1. __ + 3 = 85
  2. __ + 13 = 207
  3. __ + 7 = 136
  4. __ + 12 = 186
  5. __ + 8 = 2012
  6. __ + 9 = 2011
  7. __ + 6 = 148
  8. __ + 6 = 2014
  9. __ + 7 = 2013
  10. __ + 9 = 178
  11. __ + 1 = 2019
  12. __ + 8 = 124

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.