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Anonymous
2.3 + 5.6 = 7.9
In case that's 2/3 + 5/6, change 2/3 to 4/6, add 5/6, get 9/6, which is 1 and 1/2.
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56 = 2 * 2 * 2 * 7 = 23 * 7
56 = 392
The GCF of 56 and 64 is 8
56 = 23 × 7 196 = 22 × 72
57 + 23 = 80