Grade 1 · Math · Building Confidence
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.
Missing Addends Within 20
Grade 1 · Building confidence · 12 questions · Version PG-VPYCYM-RBT8
1.__ + 1 = 20
2.__ + 18 = 20
3.__ + 1 = 9
4.__ + 3 = 7
5.__ + 1 = 12
6.__ + 14 = 18
7.__ + 15 = 20
8.__ + 14 = 14
9.__ + 2 = 20
10.__ + 8 = 13
11.__ + 0 = 8
12.__ + 7 = 14
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 = 2019
- __ + 18 = 202
- __ + 1 = 98
- __ + 3 = 74
- __ + 1 = 1211
- __ + 14 = 184
- __ + 15 = 205
- __ + 14 = 140
- __ + 2 = 2018
- __ + 8 = 135
- __ + 0 = 88
- __ + 7 = 147
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.