To simplify a fraction, you need to identify any common divisors between the numerator and denominator. In this case, both 45 and 15 can divide by 15. Do this and we get 3/1. Any number divided by 1 gives itself. Thus 45/15 can be simplified to 3.
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12/45 = 4/15
yes: 15 over 37
3/5 ÷ 4/15 3/5 * 15/4 45/20 9/4■
12:45 and if you simplify it , it becomes 4:15
45/113 is already in its simplest form