84
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56 feet (simply divide 672 by 12)
84
672 ÷ 8 = 84
672 is an even number, so it divides by 2. Do this. 672/2 = 336. Also even, so divide by two. 336/2 = 168. Also even, so divide by two. 168/2 = 84. divide by 2 84/2 = 42. divide by 2. 42/2 = 21. 21 is not even. Does it divide by 3 ? Bingo !! count up the twos above - 5 of them. So, 672 = 2x2x2x2x2x3x7.
1 x 672 = 672 2 x 336 =672 3 x 224 = 672 4 x 168 = 672 6 x 112 = 672 7 x 96 = 672 8 x 84 = 672 12 x 56 = 672 14 x 48 = 672 16 x 42 = 672 21 x 32 = 672 24 x 28 = 672