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Sayid scored $\frac{21}{25}$ on a recent exam. Build up this fraction so that the denominator is $100\text{,}$ so that Sayid can understand what percent score he earned.

Solution

To change the denominator from $25$ to $100\text{,}$ it needs to be multiplied by $4\text{.}$ So we calculate

$\begin{aligned} \frac{21}{25}\amp=\frac{21\cdot4}{25\cdot4}\\ \amp=\frac{84}{100} \end{aligned}$

So the fraction $\frac{21}{25}$ is equivalent to $\frac{84}{100}\text{.}$ (This means Sayid scored an $84\%\text{.}$ )