.month whiteboard.Up to 115 meters high... Let the students review the recognition in the novel knowledge. Students usually get bored with doing the exercises while consolidating their exercises. They feel that they are not interesting. We use multimedia to constantly change the form of practice when designing classroom exercises. For example, when teaching "Adding Law within 1000", use the multimedia courseware to design the exercise as a game, and divide the title into several levels according to the difficulty of the exercise. There are single wooden bridges, picking strawberries, climbing mountains, swimming children's playgrounds, and setting up only ??After the first pass, you can take the second pass, and there are encouraged procedures. Driven by the ambition of the students, students constantly overcome difficulties and struggle hard according to their own abilities. Many students have successfully passed the gate and reached the destination. Although the amount of practice is large, the students have no tired feelings, and the feeling that excitement is the joy of success. After class, the students said: This kind of practice is really strong. This kind of practice design, each classmates operate their own computer, carry out different levels of practice according to their own situation, teachers can always according to different situations of students