? The content of "the order of numbers" is taught on the basis of counting, reading and writing. By filling in the table within 100, students can have a deeper understanding of the order of numbers within 100, understand the position of each number in the table and its relationship with adjacent numbers, and have a clearer understanding of the size of numbers within 100. At the same time, through the observation of this table, we can find some interesting arrangement rules, which can develop students' thinking, broaden their thinking and improve their interest in learning mathematics. The teaching focus of this course is to make students further consolidate their knowledge of the meaning, number of digits, reading and writing of numbers by finding out the arrangement rules of numerical tables within 100. The difficulty is to help students understand the order of numbers and master some arrangement rules.

According to the arrangement of teaching materials and the age characteristics of students, in order to make students have a clear understanding of the arrangement order of numbers within 100 and the relationship between the position of each number in the table and the adjacent numbers, I arranged "two observations" to complete the teaching task. The first time is to observe the numerical table that has not been completely filled in, so that students can observe according to the existing figures, and fully express their opinions through observation, thinking and discussion, so as to discover the law and arrangement order of these known figures and stimulate all students' desire to acquire knowledge. With this desire, students have the consciousness of active learning. Under the guidance of this consciousness, students actively think and complete the form in an excited and active atmosphere. The second observation is that after the students fill in the number table, they analyze the number table completely from top to bottom, from left to right, from small to large ... This is an open topic, which inspires and guides students to observe and think from different angles and makes them feel that this small table contains a lot of mathematical knowledge.

After the whole class, I found that there was a big gap between the children, and it took about ten minutes to fill out the form. I think we can use the time before class to lead children to fill out forms, and focus on observing the rules, applying the rules and expanding their thinking in class.