MATHEMATICS GAME
Make the Right Call
Plan a purchase. Pick a stopping time. Make the numbers work.
5MISSIONS
20–30 minutesEXPECTED TIME
Exponential growth and decayCURRENT TOPIC
N1
Camera FundA club savings account
N2
Used BikeA bike’s changing price
N3
Culture JarA growing test culture
N4
Clean WaterA water-cleaning trial
N5
Club PrinterSavings rise while the price falls