"Biduoduo" is learned on the basis that students have established the concept of number size and preliminarily understood the meaning of addition and subtraction and their relationship. The purpose of comparison is to deepen the understanding of the concept of more and less, and feel the quantitative relationship between more and less.

In this lesson, I mainly let students experience the process of comparing things and experience the one-to-one method through counting and comparing activities. Understand the same concept as more and more and less; Master the method of comparison; Cultivate visual observation and language expression ability.

In this class, I pay special attention to the following aspects:

First, pay attention to cultivating students' sense of numbers.

For example, when introducing the symbols ">" and "<" = ",I first show the RMB that students are familiar with through the physical map, first compare the size and angle of RMB, which leads to" > ","<, = ",then compare the angle and the size of minutes, which leads to" > ",<, =", and finally compare the sizes of elements. In this way, through the introduction of things that students are familiar with, abstract and blunt introduction is avoided.

For another example, in the process of comparison, I first chose two pots of oranges as the physical map, so that students can compare them through observation and get the concepts of more, less and equal. Then ask the students to answer the questions in complete sentences by observing and comparing. This not only cultivates students' observation ability, but also cultivates students' language expression ability.

Second, pay attention to cultivating students' practical ability.

For example, in the consolidation exercise, I designed a link for students to operate, so that students can put a pendulum with a disk. What is the relationship between the number of discs and the number of vases? Both hands and brains, and at the same time get the training of thinking.

Third, pay attention to cultivating students' mathematical thinking ability.

For example, in consolidation exercises, I design students to put a pendulum with a disk. What is the relationship between the number of discs and the number of vases? This not only exercises students' observation ability, but also exercises students' mathematical thinking ability.

Fourth, pay attention to cultivating students' problem-solving ability.

For example, in consolidation exercises, I design students to put a pendulum with a disk. What is the relationship between the number of discs and the number of vases? Then let the students solve the problems in life in the same way-the comparison between pencil box and pencil. This not only cultivates students' ability to solve problems, but also cultivates students' awareness of application.

Shortcomings of verb (abbreviation of verb):

Because this lesson is mainly to let students compare the size of physical pictures, it is not enough to guide students to say complete words. For example, when students answer many questions, they should be asked to answer them in complete sentences, which is more conducive to students to form good study habits.