When adding two or more unlike fractions, yes.
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No because the numerator and the denominator must be multiplied or divided by the same number for a given equivalent fraction
by multiplying the denominator with the whole number and adding the numerator. the denominator will remain the same.
Same as for adding: If the denominators are not equal, you must first find a common denominator, then convert both fractions to that common denominator.
The denominator should be the same as the denominator of the fraction.
Simply change the numerator and you will have another - different - fraction wit the same denominator.