1. Knowledge goal: Understand the meaning of percentage in specific situations and read and write percentage correctly.

2. Ability goal: to cultivate students' learning ability of observing, thinking, comparing, analyzing, summarizing, communicating with others and cooperative learning in the process of cooperative learning.

3. Mathematical thinking: cultivate students' good thinking habits and develop abstract ability.

4. Emotional goal: let students feel the close connection between mathematics and life, and enhance the enthusiasm of mathematics learning.

Teaching focus:

The meaning, reading and writing of percentage.

Teaching difficulties:

The connection and difference between percentage and score.

Preparation of teaching AIDS and learning tools: teachers prepare courseware; Students collect percentages around them.

Teaching time: 1 class hour

Teaching process:

(1) Review of old knowledge.

Teacher: We learned something about fractions earlier. Let's review the relevant knowledge (PPT demonstration). Please look at the big screen:

1, the fraction can not only express the relationship between () kinds of quantities, but also express the () of an object.

The student replied:

Health 1: ... Health 2: ... Health 3: ...

2. Take the following fraction as the fraction of 100.

= = = = =

(2) Introducing dialogue to pave the way for new class teaching.

Teacher: Before class, the teacher asked everyone to collect the percentage of life. Students, have you collected the percentage of life?

Health: I collected it.

Teacher: Show and communicate with you.

Health 1: ... Health 2: ... Health 3: ...

Teacher: The teacher also brought some "percentages" today.

Teacher: Show me the theme map and other pictures on page 77 of the text.

Numbers like the above, such as 18%, 50%, 64.2% ... are called percentages.

Today we are going to learn "percentage". Writing on the blackboard: 6. Percentage (1)

Teacher: One of the most important aspects in learning is to learn to ask questions. Students, what do you want to know when you see the topic of "percentage"

Health 1: ... Health 2: ... Health 3: ...

Teacher: I'll sort out the students' questions, mainly as follows: ... (The teacher writes on the blackboard while talking to show the goal)

Learning objectives:

1. What is the percentage of understanding and remembering?

2. Be able to read and write correctly;

3. Understand the relationship and difference between percentage and score.

(C) new knowledge teaching

1. Show the test questions (PPT presentation).

(1) What is a percentage?

(2) Read the following percentage.

18% is pronounced _ _ _ _ _ _ _ _;

75.9% is pronounced _ _ _ _ _ _ _;

120% is pronounced _ _ _ _ _ _ _ _;

400% is pronounced _ _ _ _ _ _ _.

(3) Write the following percentage.

2% writing _ _ _ _ _ _ _;

Fifteen point four percent writing _ _ _ _ _ _ _ _;

30% writing _ _ _ _ _ _ _;

0.6% writing _ _ _ _ _ _ _;

1.8% writing _ _ _ _ _ _ _;

Forty-two percent of people write _ _ _ _ _.

(4) Can you tell the meaning of the following percentage?

18% means _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

130% means _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

(5) What are the similarities and differences between percentage and score in meaning?

After trying to show the questions, the teacher said, students, look at the questions one by one. Can you solve these problems?

Student 1: Can solve some ... Student 2: No. ...

Seeing that the students can't solve the problem by shaking their heads, the teacher added: no, it doesn't matter, let's go to the textbook to find the answer!

2. Self-study teaching materials.

Teacher: Please turn to page 82 and teach yourself 82-83 pages around the following study outline.

Learning outline (displayed on the blackboard and distributed by each student):

(1) Understand and talk about percentages in your own way. What is the percentage called? (Numbers such as 14%, 65.5%, 120% ... are called percentages, indicating what percentage one number is of another. Percentage is also called percentage or percentage)

(2) How to write the percentage? How to pronounce percentage? Give examples. Percentage is a special kind of score, which has its own unique form in reading and writing. Writing: Percent is usually written not as a fraction, but as a percent sign ("%"), that is, the numerator is written as "%"; Pronunciation: pronounce "%"as …, and then read the number before the percent sign.

(3) What are the similarities and differences between percentage and score? Similarities between percentage and fraction: both can express the relationship between the two quantities; The meaning difference between percentage and fraction: fraction can also represent a quantity, which can take units; Percentages cannot represent quantity, so percentages cannot have units. )

3. Try to practice. At the same time, there are three students performing on the blackboard (one is good, one is medium and one is poor).

4. Group discussion.

Teachers guide group discussions around the following questions, and initially gain knowledge and experience:

(1) Let's compare the results of the self-study textbook. Did you do the same as me? Think about it. Did you do the right thing? If not, whose is right? Whose fault is this? What's the matter?

(2) Group summary:

What is a percentage?

How to pronounce percentage?

How to write the percentage?

What are the similarities and differences between percentage and score in meaning?

Similarities: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Difference: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

5, group report, teachers according to the report to supplement, and form knowledge and experience.

Percentage indicates the percentage of one number in another, such as 14%, 65.5%, 120% ... called percentage. Percentage is also called percentage or percentage.

How to read the percentage: read the percent sign "…" first, and then read the number before the percent sign. Such as: 15.5%

How to write the percentage: write the number first, then the percent sign "%". For example, 120%

(4) Try to practice

1. Divide the following fractions into fractions of 100 and convert them into percentages.

=_________= ; =_________=

2. Do the textbook page 83 1 and 2 questions.

(5) Class assignments

1. What percentage of the following percentage indicates who is who?

(1) The population of China accounts for 22% of the world's total population.

(2) The cultivated land area in China accounts for 7% of the total cultivated land area in the world.

2. Judges.

(1) A fraction with a denominator of 100 is called a percentage. ( )

(2) The percentage of 50% should be reduced to. ( )

(3) A wire is 57% meters long. ( )

3. Synchronization Guide, pp. 84-85 1 classroom practice.

(6) Class summary, extending the class.

1. Teacher: Students, what have you gained from today's study?

Student 1: …… Student 2: …

2. Teacher: The teacher is really happy for you. Look at the following sentence. What do you have in mind? Courseware presentation: genius =99% sweat+1% inspiration.

Student 1: …… Student 2: …

That's all for today's class. Class is over.

Blackboard design:

Numbers like the above, such as 18%, 50%, 64.2% ... are called percentages.

A number indicating that one number is a percentage of another number is called a percentage. Percent (also called percentage or percentage) Percent indicates the relationship between two quantities, and it cannot take units.