Missing Addend Worksheets
A missing addend problem is an addition sentence wearing a disguise, and it is the first algebra a child meets. The step that matters is realizing 7 + ? = 15 can be answered by subtracting — that is the inverse relationship, and it is worth far more later than the answers themselves.
Missing Addend
Name:Date:Score:
- 1 + 1 = 12
- 27 + = 27
- 3 + 7 = 25
- 412 + = 26
- 59 + = 18
- 615 + = 30
- 7 + 16 = 26
- 81 + = 8
- 94 + = 10
- 103 + = 16
- 1115 + = 33
- 1219 + = 39
- 1311 + = 15
- 146 + = 19
- 1515 + = 31
- 16 + 3 = 4
- 17 + 11 = 29
- 18 + 2 = 16
- 191 + = 7
- 207 + = 9
Printable Worksheets for Kids · printableworksheetsforkids.pages.dev
Answer key (20 answers)
- 1. 11
- 2. 20
- 3. 18
- 4. 14
- 5. 9
- 6. 15
- 7. 10
- 8. 7
- 9. 6
- 10. 13
- 11. 18
- 12. 20
- 13. 4
- 14. 13
- 15. 16
- 16. 1
- 17. 18
- 18. 14
- 19. 6
- 20. 2
What to watch for when you grade this sheet
- Adding the two visible numbers instead of finding the difference.
- Guessing and checking one number at a time rather than subtracting.
- Reading the box as 'the answer' wherever it appears in the sentence.
One thing that helps
Mix in a few problems where the box comes first (? + 6 = 13). Children who only ever see it in the second position often cannot handle the switch.