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You have to make the denominators of the fractions equal. For example, if you have

\frac{1}{2} + \frac{1}{3} = ?

you can multiply the first fraction by 3 and the second one by 2 to make them have the same denominator.

\frac{3}{6} + \frac{2}{6} = ?

Then, simply add the two numerators together:

\frac{3}{6} + \frac{2}{6} = \frac{5}{6}

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