Rich life content and experience are the source and foundation of children's language expression. Only with rich life experience and experience, children will have what they are willing to express and communicate, and they will have something to say and have something to say. Children have something to say and want to say in formal math activities through many experiences of operation and oral practice accumulated in informal activities and children's experience gained in theme life. For example, in the counting activity of "dividing families", when children are asked to classify an object according to a certain characteristic, they are willing to give their reasons: "sharp mouth, not sharp mouth; Can fly and can not fly; Have a tail "and so on. The sources of these languages come from themes. In the process of developing the theme, children have a certain understanding and mastery of the characteristics and living habits of animals. Therefore, in the process of speaking, they can grasp the obvious characteristics of animals. With content, children will be willing to talk.