Question

Fill in the blank box in each of the following:

$\frac{7}{4}=\frac{21}{\left[\right]}$

Answer 1

We know that $7\times 3=21$

This means to get a numerator $21$ we have to multiply by $3$ in both numerator and denominator.

So, $\frac{7}{4}=\frac{7\times 3}{4\times 3}=\frac{21}{12}$

Hence, $\frac{7}{4}=\frac{21}{\left[12\right]}$.