PencilGo
Sign in

Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 7

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-UX0D96-1OAJ

Free printable
1.__ + 6 = 20
2.__ + 15 = 20
3.__ + 13 = 20
4.__ + 1 = 9
5.__ + 4 = 20
6.__ + 8 = 20
7.__ + 18 = 18
8.__ + 2 = 20
9.__ + 0 = 20
10.__ + 3 = 20
11.__ + 5 = 20
12.__ + 8 = 13
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 7
  1. __ + 6 = 2014
  2. __ + 15 = 205
  3. __ + 13 = 207
  4. __ + 1 = 98
  5. __ + 4 = 2016
  6. __ + 8 = 2012
  7. __ + 18 = 180
  8. __ + 2 = 2018
  9. __ + 0 = 2020
  10. __ + 3 = 2017
  11. __ + 5 = 2015
  12. __ + 8 = 135

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.