It could be written these ways:
645/100
or
6 45/100
or reduced
6 9/20
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6/45 = 2/15
0.645 written as a fraction would be 645/1000, which reduces to 129/200.
0.645 = 645/1000 = 129/200
The divisors of 645 are: 1, 3, 5, 15, 43, 129, 215, 645.
645 - 577 = 68