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The GCF of 24 and 64 is 8. You use the distributive property to show another way to write the sum. 8(3 + 8)
6(5 + 11)
-4.2x - 6y + 3.6
Some people use the distributive property to add 24 and 36, but you wouldn't use it to find the GCF which, by the way, is 12.
Using my knowledge of greatest common factors and the distributive property, I can tell that 45 + 63 is equal to 9(5 + 7) or 9 x 12, which is 108. Of course, I could also tell that from my knowledge of addition.