13+23\dfrac{1}{3} + \dfrac{2}{3}
13+23\dfrac{1}{3} + \dfrac{2}{3}
Since these fractions have the same denominator, we can just add the numerators
13+23=33\dfrac{1}{3} + \dfrac{2}{3} = \dfrac{3}{3}
33\dfrac{3}{3} can be reduced, since 33 is a factor of both 33 and 33:
33÷33=1\dfrac{3}{3} \div \dfrac{3}{3} = 1
The fraction is now in lowest terms