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(2 x 9) + (3 x 9) = 5 x 9 = 45 The GCF is 9.
9(2 + 3) = (9 x 2) + (9 x 3) = 9 x 5 = 45
45 + 30 (GCF = 15) = 15*3 + 15*2 = 15(3 + 2)
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.
(4 x 6) + (5 x 6) = 9 x 6 = 54