find GCF(Greatest Common Factor) then subtract
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It is an instruction for you to carry out the arithmetic operation of subtraction on fractions whose denominators are not the same.
convert at least one of them so that they have the same denominator, then proceed with the addition or subtraction
No. If the denominators are the same, you subtract the numerators. If the denominators are different you have to find the least common denominator.
If the denominators are the same, subtract the numerators. If the denominators are different, convert them to equivalent fractions with a common denominator and subtract the numerators.
multiply the fractions until they have common denominators and then subtract them