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.
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4x + 9 = 73 4x = 64 x = 16
73 is 9 more than the product of 4 and 16
It takes 15 minutes to get to 0700 and another 58 to reach 758SO ...15 + 58 = 73 minutes
The divisors of 645 are: 1, 3, 5, 15, 43, 129, 215, 645.
645 - 577 = 68