Question

Sally buys 400 feet of fencing to put up a fence around her backyard. If she ends up using 7/8 of it, how much fencing will she have left over?

Answer 1

We should start by finding how much she did use:

7/8 * 400 = 350 feet used

To find how much she has left, subtract 350 from 400 to get 50 feet.