What is 15 as a decimal?

Here I converted the original fraction to a fraction with the denominator being 10, because decimals can be written in the tenths place.

$\mathrm{Divide} \mathrm{numerator} \mathrm{and} \mathrm{denominator} \mathrm{with} \text{'}2\text{'}\frac{1}{5} x \frac{2}{2} = \frac{2}{10} = 0.2$