We use percents when we buy items, when we do math in school, when we do bills, and grade tests. Example: there is a 5% off sale. And for the test you got 91%, or your mom has to may bills every day almost. If this helped, thank me please. If this really helped, do all plus including crown me bainleist answer. Rate, and comment it helps me to improve my answering so I can do better to help you. :D Thank you......