Question

Olivia bought 3 pizzas for her birthday party. At the birthday party, they ate 2 4/7 pizzas. What fraction of a pizza does she have left?

Answer 1

In order to determine the pizza left, subtract 2 4/7 to 3, as follow:

write 2 4/7 as a fraction:

$2\frac{4}{7}=2+\frac{4}{7}=\frac{14+4}{7}=\frac{18}{7}$

now, consider that 3 = 21/7. Then, you have:

$3-2\frac{4}{7}=\frac{21}{7}-\frac{18}{7}=\frac{21-18}{7}=\frac{3}{7}$

Hence, 3/7 of the pizza is left after they ate 2 4/7 pizzas.