Workbook Detail
Number Bonds Addition Within 20 Fill One — Set 45
Complete the number bond: 15 = 4 + __
Show answer
Answer: 11
- SubType
- number-bonds
- Total
- 15
- KnownPart
- 4
- MissingPart
- 11
- Difficulty
- normal
Number bond: 18 = ? + 8
Show answer
Answer: 10
- SubType
- number-bonds
- Total
- 18
- KnownPart
- 8
- MissingPart
- 10
- Difficulty
- normal
Complete the number bond: 19 = __ + 14
Show answer
Answer: 5
- SubType
- number-bonds
- Total
- 19
- KnownPart
- 14
- MissingPart
- 5
- Difficulty
- normal
12 = __ + 8
Show answer
Answer: 4
- SubType
- number-bonds
- Total
- 12
- KnownPart
- 8
- MissingPart
- 4
- Difficulty
- normal
Number bond: 6 = 1 + ?
Show answer
Answer: 5
- SubType
- number-bonds
- Total
- 6
- KnownPart
- 1
- MissingPart
- 5
- Difficulty
- normal
Number bond: 15 = ? + 9
Show answer
Answer: 6
- SubType
- number-bonds
- Total
- 15
- KnownPart
- 9
- MissingPart
- 6
- Difficulty
- normal
Complete the number bond: 2 = __ + 1
Show answer
Answer: 1
- SubType
- number-bonds
- Total
- 2
- KnownPart
- 1
- MissingPart
- 1
- Difficulty
- normal
Complete the number bond: 4 = 2 + __
Show answer
Answer: 2
- SubType
- number-bonds
- Total
- 4
- KnownPart
- 2
- MissingPart
- 2
- Difficulty
- normal
Teaching Notes
Download this free number bonds addition within 20 fill one math worksheet. Uniquely generated with an answer key — great for homework, practice, or assessment.
Frequently Asked Questions
How do I use this Number Bonds Addition Within 20 Fill One Math Worksheet worksheet?
Print the worksheet and complete the problems. Each set number generates a unique arrangement. Use the same set number for all students in a class for consistent assessment.
Is there an answer key?
Yes — every worksheet includes a complete answer key. Print it separately or view it on screen.