Number Bonds to 20 Worksheets
Find the missing part of each number bond up to 20.
Number Bonds to 20
Name:Date:Score:
Number bonds: find the missing part so that the two parts make the whole.
- 111 = + 9
- 214 = 13 +
- 312 = 10 +
- 416 = + 1
- 513 = 1 +
- 617 = 8 +
- 714 = 4 +
- 817 = + 17
- 918 = + 14
- 1018 = 7 +
- 1115 = + 0
- 1213 = 8 +
- 1315 = 14 +
- 1416 = + 7
- 1515 = 6 +
- 1619 = + 12
- 1718 = + 7
- 1811 = 2 +
Printable Worksheets for Kids · printableworksheetsforkids.pages.dev
Number Bonds to 20
Name:Date:Score:
Number bonds: find the missing part so that the two parts make the whole.
- 111 = 11 +
- 213 = + 8
- 317 = + 14
- 416 = 1 +
- 514 = + 7
- 617 = 3 +
- 713 = + 10
- 815 = + 7
- 913 = 11 +
- 1012 = + 12
- 1120 = 1 +
- 1216 = + 13
- 1320 = + 9
- 1412 = + 2
- 1512 = 0 +
- 1620 = 8 +
- 1720 = + 6
- 1818 = + 11
Printable Worksheets for Kids · printableworksheetsforkids.pages.dev
Number Bonds to 20
Name:Date:Score:
Number bonds: find the missing part so that the two parts make the whole.
- 117 = 7 +
- 217 = + 10
- 313 = + 13
- 413 = 6 +
- 518 = 12 +
- 620 = 19 +
- 714 = + 4
- 817 = 8 +
- 912 = + 10
- 1011 = + 3
- 1117 = + 6
- 1213 = + 3
- 1315 = 5 +
- 1412 = 7 +
- 1520 = + 5
- 1613 = 12 +
- 1719 = + 2
- 1816 = + 4
Printable Worksheets for Kids · printableworksheetsforkids.pages.dev
Answer key — Sheet A (18 answers)
- 1. 2
- 2. 1
- 3. 2
- 4. 15
- 5. 12
- 6. 9
- 7. 10
- 8. 0
- 9. 4
- 10. 11
- 11. 15
- 12. 5
- 13. 1
- 14. 9
- 15. 9
- 16. 7
- 17. 11
- 18. 9
Answer key — Sheet B (18 answers)
- 1. 0
- 2. 5
- 3. 3
- 4. 15
- 5. 7
- 6. 14
- 7. 3
- 8. 8
- 9. 2
- 10. 0
- 11. 19
- 12. 3
- 13. 11
- 14. 10
- 15. 12
- 16. 12
- 17. 14
- 18. 7
Answer key — Sheet C (18 answers)
- 1. 10
- 2. 7
- 3. 0
- 4. 7
- 5. 6
- 6. 1
- 7. 10
- 8. 9
- 9. 2
- 10. 8
- 11. 11
- 12. 10
- 13. 10
- 14. 5
- 15. 15
- 16. 1
- 17. 17
- 18. 12
About this skill
Bonds to 20 build mental flexibility. Ask the child to explain how they found the missing number.
How to teach it
- Teach strategies — counting on, doubles, making ten — alongside the facts.
- Use counters or coins for new ideas before moving to the page.
- Check the ones column first, then the tens, and always write carried numbers small.
Mistakes to watch for
- Forgetting to add the carried number into the next column.
- Starting a column sum from the left instead of the right.
