You convert them to equivalent fractions with the a common denominator. This new denominator must be a common multiple of the denominators. The Least Common Multiple (LCM) may be a recommendation but is not necessary. However, using the LCM will keep all the numbers as small as possible and that may be an advantage.
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A common denominator is required to add or subtract fractions and not otherwise.
You can add or subtract fractions only if they are "like" fractions, that is, only if they have the same denominator - unless you know your fractions really well.
because it would be diffcult to understand.[you don't add or subtract the demonters]
no, to add and subtract like and unlike fractions the denominator has to be the same,
You convert to a common denominator first. Then you add or subtract the numerator and write it in simplest form