"The Meaning of Proportion" Ratio and Proportion PPT Courseware

Description

"The Meaning of Proportion" Ratio and Proportion PPT Courseware

teaching objectives

1. Use typical examples of national flags of different sizes to experience the process of finding ratios and understanding proportions.

2. Understand the actual meaning of proportion and be able to judge whether two ratios can form a proportion.

3. Understand the mathematical laws implicit in the national flag, enrich knowledge about the national flag, and cultivate feelings of love for the flag and the motherland.

Students think about it and tell them where they have seen the national flag.

There are five general specifications for the national flag:

(1) Length 288cm, width 192cm;

(2) Length 240cm, width 160cm;

(3) Length 192cm, width 128cm;

(4) Length 144cm, width 96cm;

(5) Length 96cm, width 64cm.

Select two flags of any size and find the ratio of length to width or width to length respectively.

(1) Length 288cm, width 192cm;

(2) Length 240cm, width 160cm;

(3) Length 192cm, width 128cm;

(4) Length 144cm, width 96cm;

(5) Length 96cm, width 64cm.

practice

1. Determine which of the two ratios in the following groups can form a proportion.

(1) 7:3 and 21:9

(2) 0.5:24 and 1.5:3.6

(3)8:6 and 1/6:3/4

(4) 3/10: 1/4 and 6/25: 1/5

2. 2 bags of rice weigh 16 kilograms, and 5 bags of the same rice weigh 40 kilograms. Find the ratio of the rice mass and the number of bags respectively, and determine whether they can form a proportion.

3. (1) Write two ratios whose values ​​are both 7 and form a ratio.

(2) Write the ratio of two ratios that are both 1/3 and form a proportion.

(3) Write the ratio of two ratios, both of which are 1.5, and form a ratio.

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Update Time: 2024-09-29

This template belongs to Mathematics courseware Hebei Education Edition Sixth Grade Mathematics Volume 1 industry PPT template

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