Question

Which is greater 0.15 or 1/5

Answer 1

In order to do this we need to make them both fractions, or both decimals. It's much easier to make them both decimals, as you can get $\frac{1}{5}$ into decimal form by simply dividing 1 by 5. 
$1 / 5 = .20$
If 1/5 = .20, then 1/5 is greater than .15!