No.
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Yes you have to add with the same denominator. when ever you do fractions they have to have the same denominator no matter what. So thats a yes
if it has a denominator
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.
Change them into mixed numbers and add the integers and fractions together ensuring that the fractions have a common denominator.
you make fractions equivalent denominators, you add the numerators and put it over the denominator