2+4=6 6-4=2 6-2=4
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3 x 4 = 12 4 x 3 = 12 12 / 3 = 4 12 / 4 = 3
5 + 6 = 11 6 + 5 = 11 11 - 6 = 5 11 - 5 = 6
Fact families are 3 numbers that are related, just as the people in a family are related. They make a set of related math facts.
To do addition or multiplication with binary numbers, you basically use the same method as for decimal numbers. Just remember the basic addition facts, for example: 1 + 1 = 10, 10 + 1 = 11, 11 + 1 = 100, etc.
Well, darling, the fact family of 8, 5, and 40 consists of the numbers 8, 5, and their products and division results. So, in this case, the fact family would be 8 x 5 = 40, 5 x 8 = 40, 40 ÷ 8 = 5, and 40 ÷ 5 = 8. It's as simple as that, sugar.