15+34\dfrac{1}{5} + \dfrac{3}{4}
15+34\dfrac{1}{5} + \dfrac{3}{4}
Since these fractions have different denominators, we need to find the least common multiple of the denominators
The least common multiple of 4 and 5 is 20, so we need to multiply to make each of the denominators = 20
15∗44=420\dfrac{1}{5} * \dfrac{4}{4} = \dfrac{4}{20}
34∗55=1520\dfrac{3}{4} * \dfrac{5}{5} = \dfrac{15}{20}
Since these fractions have the same denominator, we can just add the numerators
420+1520=1920\dfrac{4}{20} + \dfrac{15}{20} = \dfrac{19}{20}