Teaching objectives

1. Ask the students to describe the relationship between two numbers by the number within context awareness 100, and use "more", "less", "more" and "less".

2. Guide students to make correct estimates, cultivate students' abilities of observation, analysis and comparison, and cultivate students' sense of numbers.

3. Let students feel the connection between mathematics and life.

Preparation of teaching AIDS and learning tools: sticks, cards, goldfish pictures, etc.

Teaching content: Page 40 of the textbook.

Teaching design

Review old knowledge and reveal the theme.

1 Number (personal answer).

A. Three tens and six ones are ().

B. Seven tens are ().

C. Eight ones and seven tens make up ().

This link uses the law of knowledge transfer, which is not only a review of old knowledge, but also a foreshadowing of new knowledge, thus successfully revealing the topic.

2. Compare the sizes of numbers.

39○36 69○96 50○50+7

Say the method of comparison. How much to learn today (blackboard writing topic).

The introduction of games brings new knowledge.

Let's play a guessing game, shall we? The teacher has some sticks in his hand. Guess how many? (Show me the stick. )

The introduction of "guess and see" game aims to stimulate students' learning enthusiasm and promote the development of teaching.

Health 1: I guess there are about 70.

Health 2: I guess there are about 36.

S3: I guess it's about 100.

Health 4: I guess there are about 40.

Health 5: I guess it is about 2 1.

……

Teacher: There are so many answers, and some guesses are quite different. Who guessed better? That's it. Count (10) first, so that students can understand 10 so much, then observe the remaining sticks and make a second estimate.

Teacher: 10 so much. Please guess how many sticks the teacher has.

Health: There are 50; There are 40; There are 45; There are 30 ...