2. Strengthen the understanding of the practical significance of measurement and the experience of the measurement process. According to the specific goal of "measurement" in the mathematics curriculum standard, organize students to carry out measurement activities.

3. Strengthen the direct perception of the surrounding environment and physical objects, develop the concept of space, and guide students to observe the shape, size and orientation of the surrounding environment and objects through various forms of activities such as operation, discussion, communication and exploration, so as to obtain the intuitive experience of simple geometric objects and plane graphics, so as to perceive the realistic three-dimensional world and form a preliminary concept of space.