You divide both the numerator and denominator by a common multiple.
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LCM is used to find the lowest common denominator in fractions HCF is used to reduce fractions to their simplest terms
The term for the simplest form for fractions is "lowest terms". If the greatest common factor of the numerator and the denominator is 1, then the fraction is in lowest terms.
U have to do it in simplest form to get a smaller nuMber froM tHE OrIGiNaL NUMber
In order to reduce fractions to their lowest terms
Yes it can be done and, at times, is a very good idea.