Express the following as a fraction in simplest form :

64.015

We have:

64.015

There are 3 decimal places, so we remove the decimal point and divide by 1000.

$\phantom{=} 64.015 = \dfrac{64015}{1000} \\[1em] = \dfrac{12803}{200} \quad \text{[Dividing both by 5]} \\[1em] = 64\dfrac{3}{200}$

∴ The answer is $64\dfrac{3}{200}$