Teaching objectives

1. Make students establish the concept of "average score" and know that average score means that every score has the same number of results.

2. Cultivate students' practical ability and generalization ability through sub-activities.

Preparation of teaching AIDS and learning tools: courseware; Ask the students to prepare physical cards and 6 square cards.

Emphasis and difficulty in teaching

1. Teaching emphasis: establish the basic concept of average score.

2. Teaching difficulties: knowing that the average score means that each copy has the same number of results.

Teaching methods and learning methods

1. Teaching methods: lecture method and situational teaching method.

2. Learning methods: independent research and development, cooperative communication method.

Teaching process design

First, create a situation and establish the concept of "average score"

(A) situational import, practical operation

1. Divide 9 pieces of sugar into 3 parts. How to divide it? Please try to score with your cards first.

2. The result of the score, especially in understanding the "average score"

3. Think about it, which division is fair? Why is this division fair?

Each serving is 3 pieces of sugar, the same.

Each share gets the same amount, which is called average score.

(2) provide materials and consolidate concepts through analysis.

Class (1) will visit the science park tomorrow. The students are preparing food. Did you find the average score?

(C) contact life, perception concept

Please use your brain to think about it. Have we ever met an average score in our life?

Second, hands-on operation, explore the "average score" method

(A) understand the meaning of the question, understand the "average score"

Divide 15 apples into five parts. How many apples are there in each part?

Do you think it's weird (what? How many shares are divided equally? )

(B) the actual operation, the "average score" application

(1) Earn one point for your own efforts.

(2) Communicate the score results and tell everyone how you scored.

(C) AC integral to enhance the understanding of "average integral"

Third, practice to deepen the understanding of "average score"

(a) discrimination exercise

Do something on page 8 of 1 textbook.

What is the average score? Draw "√" in brackets.

2. Divide the 10 box of yogurt into 2 parts on average, and each part is () box.

(2) Basic exercises

(1) A * * * has () maple leaves, each ().

, the average score became ().

(2) If 16 maple leaves are divided into two parts on average, each part has () maple leaves.

Tell me how you divided it.

Fourth, class summary.

Fifth, after-school expansion

1. Finish the exercises after class.

2. Complete the auxiliary exercises.