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.
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(2 x 9) + (3 x 9) = 5 x 9 = 45 The GCF is 9.
You need at least two numbers to find a GCF.
The GCF is 16.
9(9 + 3) = (9 x 9) + (3 x 9) = 12 x 9 = 108
3(5 + 12)