KwaNgubeni Primary compared their water usage in school by doing a water audit. They compared the amount of water they use when they wash their hands under a running tap compared with tippy taps that were installed in school. They worked out that tippy taps save about 10 times water content in school, this enabled them to think critical about their water wastage they were not exposed to prior to the water audit. With the use of practical applied mathematics, they were able to work out that difference.