Need help with frstions

Question

The cafeteria madec18 pizzas to be shared by three classes. Ms Apiho class ate 5 1/2 pizzas and Ms Nikki class ate 7 3/4 pizzas. How many pizzas was left for Mr Wills class

Answer 1

5 and 1/2 = 11/2

7 and 3/4 = 31/4

To add fractions, get a common denominator. Use 4.

11/2 = 22/4

22/4 + 31/4 = 53/4

53 divided by 4 = 13 and 1/4

18 - 13 and 1/4 =

4 and 3/4 for Mrs. Wills's class.