Teaching goal: to make students know the meaning of multiplication and how to find the sum of several identical addends. It is relatively simple to calculate by multiplication. I can read and write multiplication formula and dictate its meaning.

Teaching emphasis: understand the meaning of multiplication initially and write the multiplication formula correctly according to the requirements.

Teaching difficulty: understanding the different meanings expressed by two numbers before and after multiplication.

Teaching process:

First, the preparation of new courses

Look at the projection, listen to the tape and answer the following three questions:

1. In this donation activity of "Hand in Hand for Love". The first group Qian Wen donated 2 yuan, Qingqing donated 2 yuan and Su Qing donated 2 yuan. Please work out how much money the three of them donated.

There are four people in the second group, each of whom donated 3 yuan. How much did these four people donate?

There are six people in the third group, each of whom donated 5 yuan. Please work out how much money these six people donated.

Students' column solutions and collective corrections.

Second, the introduction of new courses.

Students, what difficulties did you encounter in the process of answering just now? There is a simple way to solve it in one step. Do you want to learn? This method is multiplication. In this lesson, let's learn "the preliminary understanding of multiplication" first.

A preliminary understanding of multiplication.

Third, the new curriculum teaching

(1) Check the students' preview and let them talk about what you want to learn.

(2) Teaching examples 1

1. Teachers and students put red flowers together and the teacher instructed them to write multiplication formulas.

(1) Please put red flowers with the teacher, two at a time and three times.

(2) Ask the students to look at the pictures and tell them how they are arranged. How many flowers are there? (Teacher's blackboard: 3 2)

(3) How many red flowers does a * * * need? How to calculate? How to form?

(4) What are the characteristics of the three addends for students to observe this question? How many identical addends add up? The derivative can also be calculated by multiplication.

(5) Know multiplication sign and teach to write multiplication sign.

Guide the students to write it again against the pinyin letter "X".

(6) Write a guide to multiplication formula.

When writing a multiplication formula, look at the same addend first. (The same addend is 2. Write the same addend 2 first, and then write "X".

How many identical addends add up? (added three twos). Write 3 after the multiplication sign. Emphasize: How did this "3" come from?

(7) Guide reading multiplication formula and tell the meaning of multiplication formula.

What does "2" mean? What does "3" mean? "2X3", what do you mean? )

2. Students put squares by themselves and try to write multiplication formulas.

Please listen to the teacher's request and put squares independently, three in each row and four in each row. (District patrol)

(1) Look at the picture and tell me how to set it. How many threes are there? (Teacher writes on the blackboard: 4 yuan and 3 yuan)

(2) How many squares do you need to put in a * * *, and how do you calculate it? How to form? (3) Are the addends in this formula the same? Can it be rewritten as multiplication formula? Try to write and communicate in study groups. How did you write it?

(4) The teacher summed up the formula of multiplication: one look, two numbers.

3. Look at the picture and say pay attention. Write the multiplication formula independently.

Show a group of round pictures. Ask the students to look at the pictures carefully. Tell each other at the same table and answer them in two ways.

4. Guide page 109 ~ 1 10. Look, read and think about what it means. And fill in the blanks in the textbook Pll0.

5. The teacher guides the students to look at three addition formulas, find out the characteristics of * * *, compare which algorithm is simple, and let the students talk about the significance of multiplication.

6. Read books and read the meaning of multiplication together.

7. Use the knowledge of multiplication to solve the three review questions before the new lesson.

Fourth, consolidate practice.

1. Textbook Page 1 10 "Doing" Question 1.

Read the formula first, and then put it on the CD.

2×3 3×2

3. Clap your hands rhythmically according to the multiplication formula.

2×5 5×2

4. What is the difference between the following two formulas? Then play "find friends" game.

4×3 3×4

Fifth, class summary.

1. What do you know through this lesson?

2. What methods have you learned?

There are still some problems that we don't understand, so let's discuss and solve them together.