Question: Which number sentence is in the fact family for 24, 42, 18?
A ) 42 + 24 = 18
B ) 24 - 18 = 42
C ) 24 - 18 = 6
D ) 24 + 18 = 42
Steps to derive
1 Fact family is a group of related facts using the same set of numbers.
2 The addition and subtraction fact family of 24, 42, and 18 is
18 + 24 = 42, 24 + 18 = 42, 42 - 24 = 18, and 42 - 18 = 24.
3 So, the number sentence 24 + 18 = 42 is in the fact family for 24, 42 and 18.
Hence the right answer is Option D
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