Fact Family Add Sub Within 20 Fill Blanks — Set 72
Write the fact family for 18, 1, 19:
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Answer: 18 + 1 = 19; 1 + 18 = 19; 19 - 18 = 1; 19 - 1 = 18
- SubType
- fact-family
- Facts
- 18 + 1 = 19
- 1 + 18 = 19
- 19 - 18 = 1
- 19 - 1 = 18
- Difficulty
- normal
Write the fact family for 15, 3, 18:
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Answer: 15 + 3 = 18; 3 + 15 = 18; 18 - 15 = 3; 18 - 3 = 15
- SubType
- fact-family
- Facts
- 15 + 3 = 18
- 3 + 15 = 18
- 18 - 15 = 3
- 18 - 3 = 15
- Difficulty
- normal
Write the fact family for 8, 2, 10:
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Answer: 8 + 2 = 10; 2 + 8 = 10; 10 - 8 = 2; 10 - 2 = 8
- SubType
- fact-family
- Facts
- 8 + 2 = 10
- 2 + 8 = 10
- 10 - 8 = 2
- 10 - 2 = 8
- Difficulty
- normal
Write the fact family for 3, 11, 14:
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Answer: 3 + 11 = 14; 11 + 3 = 14; 14 - 3 = 11; 14 - 11 = 3
- SubType
- fact-family
- Facts
- 3 + 11 = 14
- 11 + 3 = 14
- 14 - 3 = 11
- 14 - 11 = 3
- Difficulty
- normal
Write the fact family for 7, 13, 20:
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Answer: 7 + 13 = 20; 13 + 7 = 20; 20 - 7 = 13; 20 - 13 = 7
- SubType
- fact-family
- Facts
- 7 + 13 = 20
- 13 + 7 = 20
- 20 - 7 = 13
- 20 - 13 = 7
- Difficulty
- normal
Write the fact family for 8, 10, 18:
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Answer: 8 + 10 = 18; 10 + 8 = 18; 18 - 8 = 10; 18 - 10 = 8
- SubType
- fact-family
- Facts
- 8 + 10 = 18
- 10 + 8 = 18
- 18 - 8 = 10
- 18 - 10 = 8
- 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.