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.