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subtraction
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.
It really doesn't matter whichever one you are more comfortable with. fractions are a bit more challenging to convert.
You should not have any remainders in fractions!
Basic addition and subtraction.