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
[tex]\dfrac{8\cdot 2}{12\cdot 2}=\dfrac{16}{24}[/tex]
In the second case,
[tex]\dfrac{8\cdot 5}{12\cdot 5}=\dfrac{40}{60}[/tex]
Finally,
[tex]\dfrac{8\cdot 10}{12\cdot 10}=\dfrac{80}{120}[/tex]
