Therefore, the objectives of this lesson are:
(1) Let students have a preliminary understanding of cuboids, cubes, cylinders and spheres through observation and operation; Knowing their names and preliminarily perceiving their characteristics will help us to know the shapes of these objects and figures. Cultivate students' ability to operate and observe things, and initially establish the concept of space;
(2) Cultivate students' awareness of communication, cooperative inquiry and innovation with mathematics through mathematics activities; (3) Let students feel the close connection between mathematics and real life.
I import pictures of some objects that students are very familiar with in their lives, and ask students to classify them according to their shapes. Children are well divided into cubes, cuboids, cylinders and spheres. In this way, organizing teaching can make students realize that mathematics comes from life, and there is mathematics everywhere in life, which improves students' interest in learning and cultivates students' consciousness and habit of discovering mathematical problems from life.
Before class, I asked the students to prepare some items that students often see and use in real life, such as medicine boxes, tea cones, toothpaste boxes, Rubik's cube and so on. And put the collected objects together for observation, so that children can also be divided into four categories. Then work together at the same table to put different cuboids together, touch them, have a look and compare them. What did you find? Let the students discover the characteristics of the cuboid independently in the hands-on operation. Cultivate students' observation and thinking ability.
In addition, the teaching difficulty of this course is to distinguish between two cuboids with square faces and frustums close to cylinders. In order to break through this difficulty, I also designed the link of "finding friends" to let students find objects that are friends with cuboids (cylinders), with the aim of (1) consolidating their knowledge. (2) Let students feel cuboids of different sizes and shapes. (3) Grasp the wrong questions for analysis, and improve the discrimination ability. I find out these two shapes of objects and let the students judge and give reasons. Make students have a deeper understanding of these two shapes.
In the whole class, I created a lot of practical activities, so that students can operate in group cooperative learning, observe with their eyes, express in language and think hard. Students always explore and learn in a relaxed, democratic, harmonious and pleasant atmosphere, becoming the masters of the classroom, effectively improving their ability to solve problems and achieving good teaching results. As the Curriculum Standard says, let each child get different development in mathematics learning.