The GCF of 20 and 35 is 5.
(4 x 5) + (7 x 5) = 11 x 5 = 55
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(2 x 9) + (3 x 9) = 5 x 9 = 45 The GCF is 9.
3(5 + 12)
8(3 + 8)
8(3 + 4)
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.