"Ratio and Proportion" Number and Algebra PPT Courseware

Description

"Ratio and Proportion" Number and Algebra PPT Courseware

1. Introduce situations and review old knowledge

Question 1: Who can use "comparison knowledge" to talk about the relationship between male students, female students, and the number of students in the class?

Default:

The ratio of the number of boys to the number of girls is ( ).

The ratio of the number of girls to the number of boys is ( ).

The ratio of the number of boys to the number of students in the class is ( ).

The ratio of the number of girls to the total number of students in the class is ( ).

The ratio of the class size to the number of boys is ( ).

The ratio of the class size to the number of girls is ( ).

Question 2: There are so many ratios written on the blackboard. Can anyone tell me the ratio between another ratio and the ratio on the blackboard?

Monitor: Ratios are equal.

Monitoring issues:

①Is that right?

②How do you judge?

③What is the basis for judgment?

2. Sorting out old knowledge and exploring connections

Make a request for cooperation

Present information:

Cooperation requirements:

① First, talk about the connections and differences between this part of knowledge in the group.

②Write this part of the knowledge on the question paper in the way you like.

�Example: Draw a chart...�

Second report and exchange

1. Knowledge connection

Question 3: Tell me how your group grasps the internal connections of knowledge and organizes it.

monitor:

①What is the connection between ratio and proportion?

②Are there any missing knowledge points?

③Personalized praise

3. Consolidate practice

1. The ratio of the radius of the two circles is 3:5. The ratio of their diameters is ( ),

The area ratio is ( ).

2. In a ratio, two inner terms are reciprocals of each other, and one outer term is 1.5.

Another external term is ( ).

3. The area of ​​a circle is equal to the radius of the circle ( ).

A. Direct proportion B. Inverse proportion C. Disproportional D. Unable to judge

4. In proportion, the product of two external terms is constant, and the product of two internal terms is ( ).

A. Direct proportion B. Inverse proportion C. Disproportional D. Unable to judge

4. Assign homework

Homework: Exercise 17 on page 85, Questions 1 and 2.

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Update Time: 2024-12-04

This template belongs to Mathematics courseware People's Education Press Mathematics Volume 2 for Sixth Grade industry PPT template

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