Square one conversion
In these decimals, the denominator in the fraction is less than 10.
More complicated conversion
In these the fraction denominator can be from 2 to 99. There is no
guarantee that the numerator is less than the denominator. Anything to
keep your life interesting.
Rocket science conversion
Both the numerator and denominator can range from 2 to 1000. Think of
it as climbing the K2 of decimal conversion.