Change them to like fractions and proceed.
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no, to add and subtract like and unlike fractions the denominator has to be the same,
Because that is not how addition of fractions is defined.
When you want to add or subtract unlike fractions.
Like fractions have the same denominator, unlike fractions don't.
If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator.