This hard worksheet challenges first graders to reason about fact families with numbers all the way to 20. Part A presents four multiple-choice questions asking children to identify which equation belongs to a given family or which three numbers form a valid family. Part B offers five missing-number fills that connect addition and subtraction, like 7 + ___ = 16 leading to 16 - 7 = ___, pushing children to think flexibly about related facts.
Style:
Fact Families: Addition & Subtraction
Part A: Multiple Choice
Circle the correct answer for each question.
1. Which equation belongs to the fact family with 6, 9, and 15?
A) 6 + 8 = 14
B) 15 - 9 = 6
C) 9 - 6 = 3
D) 15 + 6 = 21
2. If 8 + 7 = 15, which equation is also in the same fact family?
A) 15 - 8 = 6
B) 7 + 8 = 16
C) 15 - 7 = 8
D) 8 + 8 = 15
3. Which three numbers form a fact family?
A) 4, 5, 8
B) 6, 7, 14
C) 5, 9, 14
D) 3, 8, 10
4. Anna knows 9 + 8 = 17. Which related fact can she use to check her work?
A) 17 + 8 = 25
B) 17 - 9 = 8
C) 9 - 8 = 1
D) 8 + 9 = 18
Part B: Fill in the Missing Number
Use what you know about fact families to find each missing number.
1. 7 + 9 = 16, so 16 - 7 = 9.
2. If 8 + 9 = 17, then 17 - 9 = 8.
3. The missing number: 20 - 7 = 13.
4. 6 + 12 = 18, using the fact family for 6, 12, and 18.
5. If 5 + 9 = 14, then 14 - 5 = 9.
Fact Families: Addition & Subtraction
★ Part A: Multiple Choice
Circle the correct answer for each question.
1. Which equation belongs to the fact family with 6, 9, and 15?
A) 6 + 8 = 14
B) 15 - 9 = 6
C) 9 - 6 = 3
D) 15 + 6 = 21
2. If 8 + 7 = 15, which equation is also in the same fact family?
A) 15 - 8 = 6
B) 7 + 8 = 16
C) 15 - 7 = 8
D) 8 + 8 = 15
3. Which three numbers form a fact family?
A) 4, 5, 8
B) 6, 7, 14
C) 5, 9, 14
D) 3, 8, 10
4. Anna knows 9 + 8 = 17. Which related fact can she use to check her work?
A) 17 + 8 = 25
B) 17 - 9 = 8
C) 9 - 8 = 1
D) 8 + 9 = 18
★ Part B: Fill in the Missing Number
Use what you know about fact families to find each missing number.
1) 7 + 9 = 16, so 16 - 7 = 9.
2) If 8 + 9 = 17, then 17 - 9 = 8.
3) The missing number: 20 - 7 = 13.
4) 6 + 12 = 18, using the fact family for 6, 12, and 18.
5) If 5 + 9 = 14, then 14 - 5 = 9.
Ready to Practice?
For Part A, circle the correct answer. For Part B, write the missing number on the line.
9 Questions
15-20 minutes
Auto-graded
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