Fact Family Add Sub Within 20 Fill Blanks — Set 100
Write the fact family for 15, 1, 16:
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Answer: 15 + 1 = 16; 1 + 15 = 16; 16 - 15 = 1; 16 - 1 = 15
- SubType
- fact-family
- Facts
- 15 + 1 = 16
- 1 + 15 = 16
- 16 - 15 = 1
- 16 - 1 = 15
- Difficulty
- normal
Write the fact family for 16, 2, 18:
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Answer: 16 + 2 = 18; 2 + 16 = 18; 18 - 16 = 2; 18 - 2 = 16
- SubType
- fact-family
- Facts
- 16 + 2 = 18
- 2 + 16 = 18
- 18 - 16 = 2
- 18 - 2 = 16
- Difficulty
- normal
Write the fact family for 19, 1, 20:
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Answer: 19 + 1 = 20; 1 + 19 = 20; 20 - 19 = 1; 20 - 1 = 19
- SubType
- fact-family
- Facts
- 19 + 1 = 20
- 1 + 19 = 20
- 20 - 19 = 1
- 20 - 1 = 19
- Difficulty
- normal
Write the fact family for 6, 6, 12:
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Answer: 6 + 6 = 12; 6 + 6 = 12; 12 - 6 = 6; 12 - 6 = 6
- SubType
- fact-family
- Facts
- 6 + 6 = 12
- 6 + 6 = 12
- 12 - 6 = 6
- 12 - 6 = 6
- Difficulty
- normal
Write the fact family for 5, 11, 16:
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Answer: 5 + 11 = 16; 11 + 5 = 16; 16 - 5 = 11; 16 - 11 = 5
- SubType
- fact-family
- Facts
- 5 + 11 = 16
- 11 + 5 = 16
- 16 - 5 = 11
- 16 - 11 = 5
- Difficulty
- normal
Write the fact family for 7, 3, 10:
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Answer: 7 + 3 = 10; 3 + 7 = 10; 10 - 7 = 3; 10 - 3 = 7
- SubType
- fact-family
- Facts
- 7 + 3 = 10
- 3 + 7 = 10
- 10 - 7 = 3
- 10 - 3 = 7
- 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.