A fact family consists of a set of related addition and subtraction or multiplication and division equations that use the same numbers. For the number 5, a simple fact family could involve the numbers 2, 3, and 5. The addition equations would be 2 + 3 = 5 and 3 + 2 = 5, while the corresponding subtraction equations would be 5 - 2 = 3 and 5 - 3 = 2.
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