Grade 1 Math Practice Test: Fact Families and Related Facts
- Fact Families and Related Facts
- 10 questions
- 12 minutes
A fact family uses the same three numbers in addition and subtraction. The biggest number is always the total, so it comes first when you subtract.
Tap an option to mark your answer. You can change your mind, or tap the same option again to leave the question blank. The correct answers and explanations appear when you finish the test.Tap an option to answer; tap it again to leave the question blank.
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Question 1
Which fact is in the same family as 4 + 9 = 13?
Correct answer: C
The family uses only 4, 9 and 13, and 13 − 9 = 4 does that. The fact 9 − 4 = 5 brings in a new number, 5.
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Question 2
Which number completes this fact family?
7 + 5 = 12 5 + 7 = 12 12 − 5 = 7 12 − ___ = 5
Correct answer: A
The family uses 5, 7 and 12. Taking 7 away from 12 leaves 5, so the missing number is 7.
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Question 3
To solve 15 − 8, Ria thinks: 8 + ___ = 15. What is the missing number?
Correct answer: B
8 + 7 = 15, so 15 − 8 = 7. The answer 23 adds 15 and 8 instead of finding the missing part.
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Question 4
Which addition fact helps you solve 11 − 3?
Correct answer: D
3 + 8 = 11 tells you that 11 − 3 = 8. The facts with 14 add 3 to 11, which is the opposite of taking 3 away.
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Question 5
Sara knows that 6 + 9 = 15. What is 9 + 6?
Correct answer: A
Changing the order of the numbers you add does not change the sum, so 9 + 6 = 15 too.
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Question 6
Which three numbers make a fact family?
Correct answer: C
3 + 7 = 10, so 3, 7 and 10 belong together. In 3, 7, 11 the parts add to 10, not 11.
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Question 7
Max knows that 7 + 6 = 13. Which subtraction fact does he also know?
Correct answer: B
Taking one part, 6, away from the total, 13, leaves the other part, 7. The fact 13 − 7 = 7 is false because 13 − 7 = 6.
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Question 8
There are 14 cups. 9 cups are blue and the rest are red. Which number sentence tells how many cups are red?
Correct answer: A
Take the blue cups away from all the cups: 14 − 9 = 5 red cups. Adding 14 and 9 would count more cups than there are.
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Question 9
Which number makes this true?
___ − 4 = 8
Correct answer: D
Think addition: 4 + 8 = 12, so 12 − 4 = 8. The answer 4 comes from subtracting 8 − 4.
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Question 10
Which two facts are in the same fact family?
Correct answer: C
Both facts use only 5, 8 and 13. The pair with 8 − 5 = 3 brings in the number 3, so it belongs to a different family.
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