You first need to find a common denominator, not necessarily the least common denominator. Next, you rename the fractions according to the common denominator. Only then can you subtract the fractions.
After subtraction you should simplify the answer.
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You convert to a common denominator first. Then you add or subtract the numerator and write it in simplest form
13/14 is in its simplest form.
15
It depends on what types of fractions. But, just get the fraction down to the simplest form, or until you can't divide into it anymore. Ex. 28/7 in simplest form is 4/1
U have to do it in simplest form to get a smaller nuMber froM tHE OrIGiNaL NUMber