15+38\dfrac{1}{5} + \dfrac{3}{8}
15+38\dfrac{1}{5} + \dfrac{3}{8}
Since these fractions have different denominators, we need to find the least common multiple of the denominators
The least common multiple of 5 and 8 is 40, so we need to multiply to make each of the denominators = 40
15∗88=840\dfrac{1}{5} * \dfrac{8}{8} = \dfrac{8}{40}
38∗55=1540\dfrac{3}{8} * \dfrac{5}{5} = \dfrac{15}{40}
Since these fractions have the same denominator, we can just add the numerators
840+1540=2340\dfrac{8}{40} + \dfrac{15}{40} = \dfrac{23}{40}