## Prealgebra (7th Edition)

$\frac{y}{2}$
We can simplify by canceling out common factors of both fractions and then multiplying. $\frac{27y^3}{21}\times\frac{7}{18y^2} =\frac{/\!\!3\times/\!\!9\times y\times /\!\!y^2}{/\!\!3\times/\!\!7}\times \frac{/\!\!7}{2\times/\!\!9\times /\!\!y^2}=\frac{y}{2}$