1, combined with the specific situation, explore the oral calculation method of mastering integer ten, integer hundred and integer thousand times one digit.

Method, which can correct oral calculation.

2, in the process of peer communication, experience the diversity of computing methods.

3. Initially form a good habit of thinking independently, being good at listening and being brave in expressing.

Teaching focus

Explore and master the oral calculation method of integer ten and integer hundred multiplied by one digit.

Teaching difficulties

Cultivate students' awareness and ability to ask and solve problems in the process of discussing and solving practical problems.

teaching process

First, situational introduction

Teacher: Students, where are you laughing and being naughty?

Health: They are in the Woods.

Teacher: Yes, they are caring for the environment and transporting young trees for tree planting activities. Let's go and have a look.

Design intention: Introduce the topic of this lesson through the situation that students are interested in, stimulate students' interest in learning, and infiltrate the connection between mathematics and life.

Second, explore new knowledge.

1, 3 bundles * * * How many trees?

Teacher: Look at the picture and tell me what math information you got.

Health 1: 20 poplars per bundle.

Health 2: Each car can hold 500 trees.

Teacher: That's right, class. If you bundle poplars into three bundles. How many trees are there in a box? What method can be used to calculate?

Health 1: a bundle of 20 trees, three bundles are the sum of three twenties, and the formula is: 20+20+20=60 (tree).

Health 2: A bundle of 20 trees, 2 bundles of 40 trees and 3 bundles of 60 trees.

Health 3: It can also be calculated by multiplication. The formula is: 20X3=60 (tree).

Teacher: From these methods, we can easily find that multiplication is the simplest solution. So how does 20X3 calculate the product? We can think of 20 as two tens, and two tens X3 are six tens, so 20X3=60 (tree).

Teacher: Can you calculate 20X4=, 20X5= and 20X6=?

Teacher: Is there a trick to multiply an integer by a digit?

Health 1: There is a 0 at the end of the integer multiplier and a 0 at the end of the product.

Health 2: When calculating an integer multiplied by a number, you can first multiply a number with the number on the integer, and then add a 0 at the end of the product.

Design intention: to find the oral calculation method of multiplying integer ten by one digit.

2. How many trees did a * * * take away?

Teacher: The gardener carried away three carts of saplings. How many trees did a * * * carry away? Think about how to solve this problem.

Health 1: One car contains 500 trees, and three cars are the sum of three 500 trees. Formula: 500+500+500= 1500 (tree).

Health 2: It can be calculated by multiplication. The formula is: 500X3= 1500 (trees).

Teacher: We can think of 500 as 500, and 500 X3 = 1500, which means 1500.

Teacher: Do you know the following formula?

Teacher: Is there a trick to calculate the whole hundred times of a number?

Health: When calculating the integer hundredth of a digit, you can multiply the digit by the integer first, and then add two zeros at the end of the product.

Design intention: to find the oral calculation method of multiplying the whole hundred by one digit.

3. What did you find?

Teacher: Let's use the above method to calculate the following questions and see what you find.

Students share their findings and communicate with the class.

Teacher: Can you write another set of such formulas?

Design intention: Calculate and observe each group of formulas, and further understand and master the calculation method of multiplication oral calculation. In the process of students' exploration, communication and discovery, students' observation ability is exercised and their thinking order is improved.

Third, consolidate the practice.

Interactive practice

1. Do the math and tell me what you think.

2. Fill in the blanks.

Design intention: These two questions further consolidate the oral calculation method of integer ten and integer hundred multiplied by one digit.

3. Look at the table calculation.

Design intention: to further understand the meaning of multiplication and further consolidate the oral calculation method of integer ten and integer hundred multiplied by one digit.

Fourth, class summary.

In this lesson, we learned different oral arithmetic methods of integer ten, integer hundred and integer thousand multiplied by one digit. In the future, when you encounter integer ten, integer hundred, integer thousand multiplied by one digit, you can use what you learned today to complete the oral calculation faster and more accurately.

Design intention: through communication and summary, help students build the knowledge system of this lesson.