How do you get 0.0015 into a fraction?

0.0015 = 0.0015 / 1.0000

Cancek down the decimal point

Hence

00015/10000

Drop the prefix zeroes.

15/10000

Cancel down by '5'

3/2000

NB

We note that the original decimal has four decimal places, so the denominating decimal MUST have '1 point' AND FOUR zeroes.