Math circle 3 refers to one of the games or activities that use the magic turntable. Children are required to select three numbers on the turntable and perform a series of mathematical operations with these numbers. Magic turntable is a tool for kindergarten and primary school children to learn mathematics. It usually consists of a circular turntable and several pointers. Children can learn how to use numbers to solve problems, and at the same time improve their logical thinking and computing ability.