1, combined with the specific situation of "buying stationery", to make students understand the meaning and characteristics of decimals.

2. Be able to recognize and read simple decimals.

Teaching focus

Read and write simple decimal numbers.

Teaching difficulties

1, the understanding of decimal meaning.

2. How to write decimals?

teaching process

First, reveal the topic.

The teacher announced the teaching content of this lesson: Today we are going to learn a new knowledge-yuan, angle, minute and decimal.

Writing on the blackboard: yuan, angle, minute and decimal.

Everyone knows the knowledge of yuan, jiao and fen. What is the decimal system? We don't know each other yet. In this lesson, we will use yuan, jiao and fen to know decimals and make friends with decimals. Do you want to make a new good friend?

Second, teach new lessons.

1, cognitive decimal.

(1) Show textbook illustrations.

(2) Guide students to observe the stationery displayed in the bookcase. Let your deskmates talk about the unit price of each stationery. (Talk at the same table, please report to individual students)

(3) Write down the prices of various stationery. (2 pages of textbooks, check each other at the same table, and the teacher agrees with the results)

(4) Know these decimals.

After the students understand the meaning of decimals on the price tag, the teacher can directly tell the students that the numbers used to express the unit price of stationery on the price tag are called decimals.

Numbers like 3.50, 1.06, 16.85, 0.50, 8.00 are called decimals. (Countless decimals)

What are the characteristics of observing decimals? It is not difficult to find that decimals make sense. )

This "."is a decimal point. This is very important. For example, the assistant aunt accidentally wrote the decimal point on the notebook price tag wrong, and wrote 3.50 yuan as 0.35 yuan. What will happen? Write 35.0 yuan?

2. How to read decimals?

(1) Students try reading first.

(2) Teachers demonstrate reading.

Writing on the blackboard: 16.85 Reading: 16.85.

(3) Students read independently.

(4) Explain the requirements of decimal reading.

The decimal point "."is read as a dot, the numbers to the left of the decimal point are read as integers, and the numbers to the right of the decimal point are read one by one in numerical order.

(5) read it.

0.020.3 10.502.4 10.338.0520.004. 135

(Note: Emphasize the reading of the number to the right of the decimal point)

3. How to write decimals?

(1) How to express the price of a commodity in decimals?

(2) Try to practice: 3 yuan 5 jiao = Yuan 2 yuan 5 jiao 5 fen = Yuan 15 yuan 6 jiao = Yuan 8 jiao = Yuan 5 fen = Yuan 3 yuan 5 jiao = Yuan.

After completion, organize discussion, teachers patrol and help individual students. Finally, ask students to agree with this result. After you finish, let the students read it.

Third, classroom activities.

1, page 2 of the textbook "Try it".

2. The third question of "Practice" on page 3 of the textbook.

Fourth, consolidate practice.

1, homework for class. (Exercise on page 3 of the textbook, questions 1 and 2. )

2, small blackboard homework.

Five, homework design

1, find the decimal.

23.20.02 1.00505.0 18.0 10.7 1. 1 1

2. Fill in the blanks.

2 yuan 1 angle = yuan 7 yuan 5jiao 2 points = yuan 50 yuan 5jiao = yuan 2 yuan 5jiao 1 minute = yuan 5 1 yuan 2 points = yuan 1 angle 5 points = yuan.

Sixth, blackboard design

Buy stationery

Yuan, Angle, Minute and Decimal

Numbers like 3.50, 1.06, 16.85, 0.50, 8.00 are called decimals.

16.85 pronounced: 16.85.

3 yuan 5jiao = Yuan 2 yuan 5jiao 5 fen = Yuan 15 yuan 6jiao = Yuan.

8 Angle = yuan 5 points = yuan 3 yuan 5 Angle = yuan.