First, we have to figure out what their GCF is:
-- The factors of 32 are 1, 2, 4, 8, 16, and 32 .
-- The factors of 56 are 1, 2, 4, 7, 8, 14, 28, and 56 .
-- The common factors of 32 and 56 are 1, 2, 4, and 8 .
-- The greatest one is 8 .
32 = 8 x 4
56 = 8 x 7
(32 + 56) = (8 x 4) + (8 x 7).
(32 + 56) = 8 (4 + 7)