The way you convert a Fraction into a decimal is by turning the fraction into a fraction with a denominator of 100. Then you write a decimal point with the the numerator there behind it. If the fraction is one digit number you put the decimal point and write that one digit number. If the numerator is a two digit number you put that number behind the decimal.
I understand what you feel, sometimes I don't get things either, but you just have to try it at least.
Hope this helps!