Answer:
They ate 5/8 of the pizza.
Step-by-step explanation:
When you are adding fractions to find out how much of the pizza they ate, you need to make sure both fractions have the same denominator when you are adding. Since both denominators are the same(being 8). You can add them together. The denominator doesn't change when you are adding. 2/8 + 3/8 = 5/8. They ate 5/8 of the pizza altogether or they ate 5 slices of pizza out of 8.
