Come up with an equivalent fraction with denominator 100.
This is how you do it.
The fraction 3/25 has denominator 25. 25 times 4 is 100, so if we multiply the numerator and denominator of 3/25 by 4, we get an equivalent fraction with denominator 100.
3/25 * 4/4 = 12/100
Now that the denominator is 100, you can read the percentage directly.
12/100 is the same as 12%
3/25 = 12%