How do you write #50.1 times 10^03# in standard form?
All you're doing here is moving the decimal point three places to in order to make the number larger. You move to the right to make it bigger and left to make it smaller, just like a number line:
So, following what we know,
(.) indicates the previous decimal place.
See how there are 3 spaces in between? That's from the exponent,