6/45 = 2/15
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0.645 = 645/1000 = 129/200
129/200 is 645/1000 in simplest form. Math: 645/1000 -> 129/200
0.645 written as a fraction would be 645/1000, which reduces to 129/200.
5/645/54= 9(5)/9(6)= 5/6
It could be written these ways: 645/100 or 6 45/100 or reduced 6 9/20