? 1, let students know the meaning of scale and the types of scale;

? 2. Master the types of scale and its application in life;

? 3. Feel the close connection between mathematics and life, and feel the charm of mathematics.

Teaching emphases and difficulties:

? Types and applications of scales.

Teaching preparation:

Onion micro-course, multimedia.

Teaching process:

First, the introduction of new courses.

Hello, students. Now there is a naughty ant. It takes only five seconds to get from Shanghai to Beijing. Please use your head and think about it. How did this ant do it?

These trains, planes and other means of transportation mentioned by the students can travel from Shanghai to Beijing, but it obviously takes less than 5 seconds. However, one of my classmates is right, the map. It only takes 5 seconds for this ant to go from Shanghai to Beijing on the map, and the students are great.

The distance ants walk on the map is different from the actual distance. Obviously, the map distance is definitely shorter than the actual distance. What is the relationship between map distance and actual distance? This is what we will learn in this lesson-scales.

Second, impart new knowledge.

? 1. Play the onion lesson.

ask questions

The students learned the basic knowledge of scales through videos. Now the teacher has several questions for you:

(1) Teacher: What is the meaning of scale?

Health: indicates the proportional relationship between the distance on the map and the corresponding actual distance.

(2) Teacher: What are the types of scales?

? Student: Digital scale and line segment scale.

? The students are great!

? 3. What does1:50000 mean?

? Look at this scale first, 1 is the distance on the map, and 50000 is the actual distance, which means that 1 cm on the map means 50000 cm of the actual distance.

Third, consolidate the practice.

1. 1:3000

Student: Digital scale means that 1 cm on the map represents the actual distance of 3000 cm.

2. 1:50

Student: The scale of numerical value means that 1 cm on the map represents the actual distance of 50 cm.

3. 1:600000

Student: Digital scale means that 1 cm on the map represents the actual distance of 600,000 cm.

Fourth, homework

? A quiz on onion micro-class

Verb (abbreviation of verb) after class reflection

This course uses the onion micro-lesson to let students learn the content of scale intuitively through animation, and also integrate online education into rural teaching at a deeper level. This is a meaningful and successful attempt. To some extent, compared with traditional education, it lightens teachers' burden and attracts students' attention. Students' interest is obviously higher, and they will continue to try to use onion micro-teaching in the future.