John and Liz are sharing a large pizza. John ate 1/3 of the pizza, and Liz ate 1/5 of the pizza. How much of the pizza is left?

Question

igreen · Answer

Just add the two fractions.

First find a common denominator, which is going to be 15.

Convert both fractions to denominators with 15:

$\dfrac{1}{5} \rightarrow \dfrac{3}{15}$

$\dfrac{1}{3} \rightarrow \dfrac{5}{15}$

Add the numerators and keep the denominator:

$\dfrac{3}{15} + \dfrac{5}{15} \rightarrow \dfrac{3+5}{15} \rightarrow \dfrac{8}{15}$

So there's $\dfrac{8}{15}$ pizza left.

igreen · Answer

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