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51 = 51/1
It can be: 3*17 = 51 or 1*51 = 51
Any number multiplied by its reciprocal equals one. Thus, 51 x 1/51 = 1.
6. Written after 1 you get 16, which is 15 more than 1. Written after 5 you get 56, which is 51 more than 5.
The GCF is 1.