Learning history makes people wise, reading poetry makes people witty, and studying mathematics makes people prudent. During the joyful National Day holiday, our G4 students carried out the activity of “making your own one-liter container and playing with water”. The children made a one-liter measure, measured out a liter of water, and then played with it. The purpose of this activity was to help children build up the sense of one liter by visualizing this measuring unit. Our school attaches great importance to students’ hands-on ability, which is a conceptual work from concrete to abstract and then from abstract to concrete. In hands-on activities, children have experienced the process of knowledge exploration, grasped mathematical concepts, and mastered “true” knowledge.