Over the past year or so, our school has carried out a series of classroom teaching mode reforms, from group cooperative inquiry learning to "four-module teaching", which shows the situation and determination of education and teaching reform. Whether it is group cooperative inquiry learning or "four-module teaching" with "preview display, cooperative inquiry, strengthening guidance and consolidating training" as the main content, the theme of "taking students as the main body and teachers as the leading role" has been grasped, and the original mode of teachers speaking and students listening has gradually changed to highlight the main position of students, allowing students to learn independently and teachers to play a guiding role.

Under the new teaching mode, how can students play the role of autonomous learning and acquire new knowledge through their own cognition and exploration? In the process of students' autonomous learning, an important link is how to make students have a good self-study habit, that is, a good preview effect. Therefore, students' self-study, that is, preview before class, is particularly important in this student-centered situation. The effect of students' preview before class will directly affect the effect of group cooperative learning in classroom teaching, so the design and guidance of students' preview content becomes more important. Teachers guide students' preview forms through preview outline and counseling plan, so as to improve students' preview effect and ensure good classroom teaching effect.

Design of preview content before the second lesson

Pre-class preparation is a process in which students conduct self-study before class, put some knowledge or activities in classroom teaching in front, and let students experience the initial understanding of new knowledge first. In this process, the content and form of students' preview will directly affect students' preview effect. Helping students design preview content and preview outline is an important link for teachers to prepare lessons. Taking "the basic nature of fractions" as an example, this paper expounds how to design preview content:

1. Learning tool making and practical activities

According to the cognitive characteristics of primary school students, the learning of many knowledge in primary school mathematics needs some intuitive and vivid learning tools and hands-on activities to help students deepen their understanding and understanding of new knowledge. The production and practice of these learning tools can be put into the preview content before class, so that students can finish it independently. In the teaching of "Basic Properties of Fractions", use three identical rectangular strips of paper.

Color to represent,,, and then observe the colored part and get =

The conclusion of =. This part is put in the preview before class as the first preview.

Let the students make their own rectangular pieces of paper before class and explore them. This can not only improve students' practical ability, but also enable students to deepen their understanding of initial knowledge and new knowledge through hands-on operation.

2. Independent inquiry, induction and summary

This part is designed by the teacher before the students preview. Through in-depth study of teaching materials and teaching objectives, teachers present the new knowledge to be learned in class in the form of questions and answers or fill in the blanks, so that students can have a comprehensive understanding of the new knowledge after reading the teaching materials, and then gradually complete the questions and answers and fill in the blanks in the preview outline. Such as the teaching of "the basic nature of fractions"

Mathematically, the problem is designed as follows: (1) Observe the molecular sum of = =.

The mother is multiplied by () at the same time; Multiply the numerator and denominator of by ().

Get it. Summary: The numerator and denominator of the score are both (), and the size of the score is different.

Change. (2) Observe that the numerator and denominator of = = are divided by () at the same time.

Get it; The numerator and denominator of are divided by () at the same time. Summary:

The numerator and denominator of a fraction are at the same time (), and the size of the fraction remains the same.

3. Summarize the basic nature of the score

What problems should be paid attention to when applying the basic properties of fractions? By completing the above questions, students can initially understand new knowledge. After students have a preliminary understanding of new knowledge, they will study in groups in class, and the teacher will teach them carefully, so that students can master new knowledge skillfully and complete the teaching objectives of classroom teaching.

Guidelines and specifications for previewing

When primary school students preview at the beginning, they often have no purpose, and they don't know how to study textbooks, how to preview, how to solve problems, and so on. In the preliminary implementation of preview activities, teachers should guide and train students' preview activities on the basis of fully preparing lessons, so as to cultivate students' autonomous learning ability. Teachers should pay attention to the following points when preparing guidance for students:

First, students independently read the contents of textbooks and observe the information window, so that students can try their best to understand new knowledge, refine information and find problems through their own thinking and analysis, so as to achieve the purpose of initially understanding new knowledge.

Second, on the basis of a preliminary understanding, let students independently complete the questions in the counseling tips. In primary school mathematics textbooks, a considerable part of the content is designed in the form of solving mathematical problems, so that students can deepen their understanding of new knowledge by solving and thinking about problems themselves.

Third, let students do appropriate exercises to test the preview. Through proper practice, students can be prevented from being arrogant, and they can also find their own loopholes in preview, so as to test their preview situation.

Under the background of current curriculum reform, preview before class has become a ladder for students to learn and an important link in school education and teaching. Starting with students' autonomous learning, it improves the efficiency of classroom teaching, changes the situation of students' passive learning, and helps students learn to learn and explore. I believe that with the gradual deepening of teaching reform, the methods and contents of preview will be more and more perfect, and effective preview will play an increasingly important role in students' learning knowledge.