Topic: finishing exercises in the sixth class.

Teaching objectives:

1. Further understand and consolidate the knowledge learned in this unit and master the calculation method of multiplying three digits by two digits; Further understand the changing law of products.

2. Through practice, we can further understand the common quantitative relations, improve the application ability of knowledge, and further feel the diversity and flexibility of problem-solving strategies.

3. On the basis of independent thinking, consolidate what students have learned through exercises.

Teaching emphasis: review and sort out the knowledge learned in this unit.

Teaching difficulties: apply what you have learned and solve practical problems.

Teaching preparation: courseware

Teaching process:

First, the arrangement of knowledge system.

1. What have we learned in this unit?

2. review and organize.

(1) Review the calculation method of multiplying three digits by two digits.

Question: how to calculate the vertical of three digits multiplied by two digits?

(2) Review the common quantitative relations.

Question: What two common quantitative relations have we learned?

What other quantitative relationships do you know?

(3) Review the changing laws of products.

Question: What is the law of product change?

(4) Review the multiplication with 0 at the end of the factor.

Question: What should I pay attention to when calculating multiplication with zero at the end of the factor?

2. communication problems.

Second, leak detection and vacancy filling training.

1. Communication problems.

Teacher: What knowledge points do you think are difficult in this unit? What questions do you have during your study?

2. Complete the "Practice and Application" on pages 38-39 of the textbook.

(1) Complete the "Practice and Application" on page 38 of the textbook 1.

Let the students do oral calculations independently and talk about how to determine the number of zeros at the end of the product in communication.

(2) Complete the second question of "Practice and Application" on page 38 of the textbook.

After asking questions, let the students write independently and the teacher patrol. Pay attention to whether the students' vertical writing is standardized, and whether it is possible to carry out pen calculation with the middle and end of the factor being 0.

Handle it correctly.

In feedback, students are mainly required to explain the correct calculation method of multiplying the middle and the end of the factor by 0 in pen calculation.

(3) Complete the third question of "Practice and Application" on page 38 of the textbook.

This problem is the changing law of the product of practice. Let students practice independently first, and then talk about how to judge according to the changing law of products.

(4) Complete questions 4, 5 and 6 of "Practice and Application" on page 38-39 of the textbook.

Questions 4 and 5:

Students answer directly according to the quantitative relationship.

Question 6:

First, calculate the total operating income of this week according to the information in the table, then calculate the daily average profit, and finally calculate the profit earned in one month.

Third, the comprehensive application of promotion.

1. Complete the seventh question of "Exploration and Practice" on page 39 of the textbook.

This problem is an extension of the understanding of the law of product change. Change from one factor to two factors.

When practicing, let the students calculate the product of the questions on the left first; Then fill in the right table; Finally, guide students to observe and compare, and draw the following conclusions:

One factor "×× number" and another factor "×× number "make the product equal to the original product "×× number".

2. Complete the eighth question of "Exploration and Practice" on page 39 of the textbook.

Organize students to exchange and discuss in groups of four.

Encourage students to think from different angles and improve the flexibility of thinking.

Fourth, reflection and summary.

What did you get from this lesson? What other questions are there?