Not if you don't have a remainder.
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3
3 over 40 cannot be simplified because 3 and 40 have no common factors. Also, 3 is prime so 3 would have to be a factor of 40 for you to be able to simplify it, and 3 does not go into 40.
3
40/15 = 8/3
40 with 3 remaining 283 - 3 = 280 = 7 x 40