I. teaching material analysis

This lesson is the last lesson of Unit 1, Book 7 of the experimental textbook published by People's Education Press, and it is a mathematical practice activity class. This unit is the initial unit of this textbook, which is based on students' understanding and mastery of the number within 10,000, and consists of two parts: "Understanding the number within 100 million" and "Understanding the number above 100 million". Large numbers exist widely in life. Understanding large numbers is not only the consolidation and expansion of reading and writing numbers within ten thousand, but also one of the most basic mathematical knowledge that students must master.

From the understanding of the number within 10,000 to the understanding of the number within 100 million and above 100 million, it is another expansion of the concept of student number. However, because the number 1 100 million is too large, it is difficult for students to get an intuitive feeling by combining specific quantities. Students often make mistakes when reading and writing large numbers, which is often related to the unclear concept of numbers and the lack of rich digital feelings. Therefore, after the "understanding of large numbers" unit, this comprehensive application is arranged, so that students can experience the process of guessing, experimenting, reasoning and comparing through inquiry activities, and fully feel the number of 654.38 billion by using imaginary materials. Ask students to help them further understand the meaning of numbers and establish a sense of numbers through their perception and experience of specific numbers.

Second, the teaching objectives

1. By exploring the activities of 65438+ billion, let students experience the process of guessing, experimenting, reasoning and comparing, fully feel the number of 65438+ billion with imaginable materials, and experience and feel the application of large numbers in daily life, thus further cultivating students' sense of numbers.

2. Cultivate the habit of learning from others and communicating with others in the process of group cooperation.

3. By exploring the activities of 654.38 billion yuan, experience the process and method of problem solving, and cultivate students' problem awareness and practical ability.

Third, the importance and difficulty of teaching:

By exploring the activities of 65438+ billion, students can experience the process of guessing, experimenting, reasoning and comparing, fully feel the number of 65438+ billion with imaginable materials, and experience and feel the application of large numbers in daily life, thus further cultivating students' sense of numbers.

Fourth, the teaching method of speaking.