I assume that is 4 5/7. Here is how you do it.You multiply the whole number (in this case 4) by the denominator (in this case 7), and add the numerator (in this case 5). This will be the numerator of your improper fraction. The denominator doesn't change - in this case, it will still be 7.
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16/5
That would yield the impropper fraction of 2/1 (or simply 2 !)
12/57 can be simplified to 4/19
57% = 57/100 in fraction
57 is an integer, not a fraction.