How do you invert the remainder of division problem to a decimal?

Answer 1

You do not invert it.

However, you can convert the remainder to a decimal by carrying out a long division of the remainder divided by the original divisor.

For example, 13/3 = 4r1

Then, long division of the remainder (=1) by the divisor (=3) gives 0.33.... which is the converted remainder.

The full quotient, in decimal form is 4.33...