# To convert a mass of 300 centigrams to grams, which ratio should you multiply by?

$1 \cdot \text{centigram}$ $=$ ${10}^{-} 2 \cdot g$
$\text{1 centigram}$ is $\frac{1}{100} \times 1 \cdot g$, alternatively there are ${10}^{2} \cdot c g \cdot {g}^{-} 1$.