Question

Ethan ordered 4 sub sandwiches for a party. Each 1/2 sandwich is one serving. Does he have enough to serve 7 friends? How much is leftover or how much more is needed? Explain.

Answer 1

If each serving equals 1/2 of one sandwich then we can say there are 8 servings because there are two servings per sandwich ans 4*2=8.
If he serves each friend one serving then there will be one serving leftover because 8-7=1. 

Answer 2

Yes he has enough because 4 divided by 1/2 is 8 servings