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My little brothers homework says what is the fact family for this set of numbers 7,8,15 what does this mean?

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My little brothers homework says what is the fact family for this set of numbers 7,8,15 what does this mean?

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  1. Fact Family are when all the numbers are related some how:

    7 +8 = 15

    15 - 7= 8

    15 - 8 = 7

    Get it?


  2. 7+8=15

    8+7=15

    15-7=8

    15-8=7

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