In the process of the new curriculum reform, it is the goal of every educator to actively promote the classroom teaching mode that adapts to the new curriculum reform and improve the effectiveness of classroom teaching. "Open and clear" teaching mode is a teaching mode adopted to change the traditional single teaching mode, realize people-oriented and harmonious teaching, and promote the improvement of teaching quality. It can stimulate students' interest in learning, let them learn to learn, and actively digest, absorb and understand knowledge.

In teaching, I deeply feel that it is important to guide and practice in order to really make the primary school mathematics classroom "clear". Because practice is the basic means for students to consolidate knowledge, and it is also an important way for students to transform knowledge into skills and improve their ability to analyze and solve problems in the process of understanding and mastering knowledge. Therefore, I think that paying attention to the optimization of exercises in teaching is an important link for students to master, consolidate, explore and acquire new knowledge systematically and orderly, enlighten their thinking and develop their intelligence.

First of all, we should select the exercise content.

Practice is an important link in the teaching process. The optimization of practical design is particularly important. Therefore, we should take the teaching materials as the core, carefully and emphatically select and design exercises. A survey shows that students are generally tired of learning. The reason is that a large number of mechanical exercises make students uninterested and have low learning efficiency. Repeated exercises not only increase students' burden, but also have no effect on improving teaching quality; Similarly, too little practice is not conducive to students mastering knowledge. Therefore, exercise design should be focused. Teachers should choose the most important things from a large number of exercises for students to practice, so as to ensure that students can master knowledge with high quality and efficiency. For example, I designed the following exercises for students: (1) Draw these three angles respectively. (2) Find out where there are horns in the class, and which ones? (3) In the group, start to spell out different angles with the angles on the triangle. "This kind of exercise. I think it's much better than suddenly looking for a corner in a topic or picture. My class performance is so good that even the children who don't like to attend classes take the initiative to participate. Therefore, we should pay attention to the optimization of operation exercises when designing exercises. Design some open exercises to provide students with a broader creative space and stimulate their thinking of seeking differences.

Secondly, we should pay attention to the form of practice.

Basic exercises should be completed in every class, neither high nor low. Basic practice is to let students apply the newly acquired concepts and laws to practice for the first time, which is the direct embodiment of the content of the textbook and the first step for students to deepen their knowledge and improve their ability. So when designing exercises, I closely follow the "double basics" to design some basic knowledge exercises, so that every student can master the basic knowledge more skillfully. Especially for those students with learning difficulties who lack confidence in learning, have no ability to bear difficulties, and stop when they encounter setbacks, the design of this link allows them to experience the happiness of success. Give students more chances to succeed, and children will have more joy of success. It really makes students feel that I have made progress, and I am really good. For concepts that are easy to be confused or contents that are difficult to distinguish on the contrary, comparative exercises can be carried out, so that students can better grasp the connection and difference between knowledge, grasp the essence and grasp the law. Variant exercise is to change the non-essential characteristics of knowledge without changing the essential characteristics of knowledge, so that students can highlight their understanding of essential characteristics in different situations and improve their ability to summarize knowledge.

In short, to implement the "open and clear" strategy, we should pay attention to broadening students' knowledge in practice, improving students' ability and level, so that students can get a sense of pleasure and accomplishment in learning in a limited time, thus constantly stimulating their interest in learning and improving their academic performance.