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
645 X 73 use LONG MULTIPLICATION. 645 x 73 45150 ( 70 X 645) ( multiply by '7' and then put as '0' on the end). +1935 ( 3 x 645) 47058 ===== The answer.
The divisors of 645 are: 1, 3, 5, 15, 43, 129, 215, 645.