Grade 1 · Math · Building Confidence
Free Missing Addends Within 20 worksheet - version 2
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 · Building confidence · 12 questions · Version PG-IGE6PR-RBT8
1.__ + 1 = 20
2.__ + 9 = 20
3.__ + 13 = 20
4.__ + 1 = 5
5.__ + 7 = 20
6.__ + 1 = 14
7.__ + 1 = 8
8.__ + 0 = 20
9.__ + 8 = 20
10.__ + 5 = 20
11.__ + 1 = 12
12.__ + 8 = 12
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 2
- __ + 1 = 2019
- __ + 9 = 2011
- __ + 13 = 207
- __ + 1 = 54
- __ + 7 = 2013
- __ + 1 = 1413
- __ + 1 = 87
- __ + 0 = 2020
- __ + 8 = 2012
- __ + 5 = 2015
- __ + 1 = 1211
- __ + 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.