13+25\dfrac{1}{3} + \dfrac{2}{5}
13+25\dfrac{1}{3} + \dfrac{2}{5}
Since these fractions have different denominators, we need to find the least common multiple of the denominators
The least common multiple of 3 and 5 is 15, so we need to multiply to make each of the denominators = 15
13∗55=515\dfrac{1}{3} * \dfrac{5}{5} = \dfrac{5}{15}
25∗33=615\dfrac{2}{5} * \dfrac{3}{3} = \dfrac{6}{15}
Since these fractions have the same denominator, we can just add the numerators
515+615=1115\dfrac{5}{15} + \dfrac{6}{15} = \dfrac{11}{15}