Write as a fraction with a denominator of .
To make the denominator 30, we have to multiply
That means we must also multiply the numerator by
Write as a fraction with denominator of .
To make the denominator 24, we must multiply
So, that means we must also multiply the numerator by
Since we must also multiply the numerator by .
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as a fraction with a denominator of 
.
![[(2 x 6) / (5 x 6)] - (21 / 24)](https://media1.shmoop.com/images/prealgebra/unit2/pa.2.043.png)
as a fraction with denominator of 
.
![[(7 x 3) / (8 x 3)] - (21 / 24)](https://media1.shmoop.com/images/prealgebra/unit2/pa.2.048.png)
we must also multiply the numerator by 
.![[(5 x 4) / (7 x 4)] = (20 / 28)](https://media1.shmoop.com/images/prealgebra/unit2/pa.2.052.png)