Grade 1 · Math · Challenge
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.
Missing Addends Within 20
Grade 1 · Stretch challenge · 12 questions · Version PG-15LBJGT-1OAJ
1.__ + 0 = 10
2.__ + 17 = 20
3.__ + 10 = 20
4.__ + 20 = 20
5.__ + 18 = 20
6.__ + 7 = 20
7.__ + 0 = 9
8.__ + 0 = 20
9.__ + 5 = 20
10.__ + 5 = 11
11.__ + 8 = 8
12.__ + 0 = 6
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
- __ + 0 = 1010
- __ + 17 = 203
- __ + 10 = 2010
- __ + 20 = 200
- __ + 18 = 202
- __ + 7 = 2013
- __ + 0 = 99
- __ + 0 = 2020
- __ + 5 = 2015
- __ + 5 = 116
- __ + 8 = 80
- __ + 0 = 66
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.