The trailing 0’s mean nothing so it is .03 X .5
So now you count decimal places. There is three. This is important.
Multiply 3 X 5 and you get 15.
15 is a integer so a decimal is implied at the end.
Now you need to move the decimal three places to the left giving you .015
Lets do another:
.365 X .0432135 <= 10 digits combined are to the right of the decimal places.
365 X 432135 multiply these. Noticed I removed the zero at the beginning of the second number.
Now we have 157729275
So now we need to move the invisible decimal point on the right ten places to the left giving us .0157729275