Question

a yard contains 36 inches. 21 inches is what fraction of a yard?

Answer 1

We Know That One Yard Is 36 Inches. So, One Yard = 
$\frac{36 in.}{36 in.}$
We Need To Find What 21 Inches Of A Yard.
This Is:
$\frac{21 in.}{36 in.}$
We Cannot Simplify This Anymore. 
So, 21 inches Is $\frac{21}{32}$ Of A Yard In Fraction Form.