The key idea here is that if you multiply or divide both numerator and denominator of a fraction by the same number, you'll get an equivalent fraction.
So, starting with 8/12, let's choose three numbers, say 2, 5, and 10.
So, if we multiply both numerator and denominator by the same number, we'll get equivalent fractions.
In the first case, we have
In the second case,
Finally,