The contents on pages 33 and 34 of the textbook and some exercises in exercise 6 and review.

1. In order to help students further master the order of numbers, they will use much more, much more, much less and much less to express the relationship between numbers.

2. Make students master the method of estimation.

1. will use more, more, less and less to indicate the size of the number within 100.

2. Make students master the method of estimation.

Physical projection, oral calculation card.

Pupils' learning is always accompanied by certain situations, especially for pupils whose intuitive thinking is dominant, and their mathematics learning is always based on intuition and concrete experience. According to the cognitive order of "intuitive perception-empirical judgment-abstract data", teachers guide students to gradually establish "much more", "much less" and "little less" on the basis of extensive experience accumulation in mathematics activities through observation, discussion, speculation, verification and summary. And make full use of the small red flag, recess music and other resources in organizational teaching to consolidate and apply, which embodies the advanced concept that mathematics teaching should follow the psychological law of students learning mathematics and emphasize that students should experience the process of abstracting practical problems into mathematical models for explanation and application from existing life experiences.