Teaching material analysis and teaching suggestions of the unit information window "How many large numbers do you know-the understanding of more than 10 thousand numbers" in the ninth volume of primary school mathematics in Qingdao Edition This unit is based on students' understanding and mastery of numbers within 10 thousand, and further study and understand numbers above 10 thousand. This is another expansion of the range of number recognition, ending the understanding of integers in primary school, which is of great significance to developing students' sense of numbers and cultivating their awareness of estimation. The main teaching contents of this unit are: reading and writing more than 10 thousand; Scale comparison of more than 10,000; Rewrite tens of thousands or hundreds of millions of integers in units of "ten thousand" or "hundred million"; Find an approximation of a number; Digital coding. The information window explains the information window 1. How many books do you know? 1. The first half of the situational diagram shows the internal and external landscape of the library attached to Tsinghua University, and the words of primary school students express the number of books in the library; The second half is the number of books collected by four famous libraries at home and abroad by the end of 2002. This information inspires students to ask mathematical questions such as "How much is100000" and "How to pronounce large numbers". Second, a brief analysis of knowledge points This information window * * * arranges two red dots and a green dot, which contains the following knowledge points: (1) Let students experience the process of representing things with more than 10,000 numbers in real situations, feel the meaning of large numbers, and cultivate a sense of numbers. (2) Combining with the question "How much is100000", this paper introduces the learning of counting unit and decimal counting method. (3) Learn to explore tens of thousands or even more reading methods in combination with specific situations. Iii. Teaching suggestions 1. Guide students to establish the concept of number and develop their sense of number in real situations.