Fact Family Add Sub Within 20 Fill Blanks — Set 80
Write the fact family for 1, 8, 9:
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Answer: 1 + 8 = 9; 8 + 1 = 9; 9 - 1 = 8; 9 - 8 = 1
- SubType
- fact-family
- Facts
- 1 + 8 = 9
- 8 + 1 = 9
- 9 - 1 = 8
- 9 - 8 = 1
- Difficulty
- normal
Write the fact family for 1, 11, 12:
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Answer: 1 + 11 = 12; 11 + 1 = 12; 12 - 1 = 11; 12 - 11 = 1
- SubType
- fact-family
- Facts
- 1 + 11 = 12
- 11 + 1 = 12
- 12 - 1 = 11
- 12 - 11 = 1
- Difficulty
- normal
Write the fact family for 9, 8, 17:
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Answer: 9 + 8 = 17; 8 + 9 = 17; 17 - 9 = 8; 17 - 8 = 9
- SubType
- fact-family
- Facts
- 9 + 8 = 17
- 8 + 9 = 17
- 17 - 9 = 8
- 17 - 8 = 9
- Difficulty
- normal
Write the fact family for 8, 8, 16:
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Answer: 8 + 8 = 16; 8 + 8 = 16; 16 - 8 = 8; 16 - 8 = 8
- SubType
- fact-family
- Facts
- 8 + 8 = 16
- 8 + 8 = 16
- 16 - 8 = 8
- 16 - 8 = 8
- Difficulty
- normal
Write the fact family for 4, 4, 8:
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Answer: 4 + 4 = 8; 4 + 4 = 8; 8 - 4 = 4; 8 - 4 = 4
- SubType
- fact-family
- Facts
- 4 + 4 = 8
- 4 + 4 = 8
- 8 - 4 = 4
- 8 - 4 = 4
- Difficulty
- normal
Write the fact family for 16, 4, 20:
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Answer: 16 + 4 = 20; 4 + 16 = 20; 20 - 16 = 4; 20 - 4 = 16
- SubType
- fact-family
- Facts
- 16 + 4 = 20
- 4 + 16 = 20
- 20 - 16 = 4
- 20 - 4 = 16
- Difficulty
- normal
Teaching Notes
Download this free fact family add sub within 20 fill blanks math worksheet. Uniquely generated with an answer key — great for homework, practice, or assessment.
Frequently Asked Questions
How do I use this Fact Family Add Sub Within 20 Fill Blanks 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.