8/12 is the current fraction.
To find equaling fractions, you have to multiply or divide the numerator AND denominator by the same number.
Let's multiply them both by two.
8 times 2 = 16
12 times 2 = 24
16/24=8/12
another example would be dividing by two.
8 divided by two = 4
12 divided by two = 6
4/6=8/12