Preparation materials: a circular cardboard with a hole in the middle, two circular colored papers, a glue stick, a pair of scissors and a small wooden stick.

1. First, fold two round colored papers in half, and then fold them in half. 2. Then cut along the crease with scissors. 3. Then stick the cut colored paper on the surface of the circular cardboard with a glue stick, and stick the colored paper on the other side. 4. Then pass the stick through the center of the circular cardboard. 5. After that, the manual gyro is finished.

Now primary school students' math books are equipped with learning tools, usually plastic or cardboard, various numbers, shapes, operation symbols and so on. You must have round slices or slices that can be cut into circles, and sharp sticks or round heads that can be used in important official.