Western Normal University Edition First Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 1
People's Education Press First Grade Mathematics Volume 1
People's Education Press Second Grade Mathematics Volume 1
People's Education Press Third Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 1
Hebei Education Edition Third Grade Mathematics Volume 1
Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
People's Education High School Mathematics Edition B Compulsory Course 2
Hebei Education Edition Seventh Grade Mathematics Volume 2
Hebei Education Edition Fourth Grade Mathematics Volume 2
Beijing Normal University Edition Fifth Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 2
Category | Format | Size |
---|---|---|
Qingdao Edition Eighth Grade Mathematics Volume 1 | pptx | 6 MB |
Description
"Ratio and Proportion" PPT courseware
learning target
Understand the concept of proportion
Understand the basic properties of proportion
Able to use the basic properties of proportion to solve problems
communication and discovery
It is known that the radius of ⊙O1 is r1, the perimeter is l1, and the area is S1. The radius of ⊙O2 is r2, the perimeter is l2, and the area is S2.
Find l1:l2; S1:S2
What did you find?
l1:l2 =r1:r2; S1:S2=r²1:r²2
Example: The gravity of a person on the moon is different from that on the earth. The ratio between the two is 1:6. If an astronaut's gravity on Earth is 750 N, what is his gravity on the moon?
Solution Assume that the astronaut's gravity on the moon is x N. According to the question, we get x:750=1:6
According to the basic properties of proportion, we get 6x=750
Solve to get x=125
Therefore, the astronaut's gravity on the moon is 125 N.
Do it:
On an enlarged picture of a dragonfly, measure the width of the dragonfly's wings in acm. Knowing that the scale of the picture is 1:0.2, find the actual width of the dragonfly's wings.
Keywords: ratio and proportion teaching courseware, Qingdao edition eighth grade mathematics volume PPT courseware download, eighth grade mathematics slide courseware download, ratio and proportion PPT courseware download, .PPT format;
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"Understanding Ratio" Ratio and Proportion PPT Courseware:
"Understanding Ratios" Ratio and Proportion PPT Courseware Teaching Objectives 1. Combine with specific examples and experience the process of understanding ratios. 2. Understand the meaning of ratio and ratio, and know the relationship between each part of ratio and the parts of division and fraction; be able to write the ratio of two numbers, and be able to calculate the ratio. 3. Feel...
"Basic Properties of Ratios and Simplified Ratios" Flash animation courseware on ratios and proportions:
"Basic Properties of Ratios and Simplified Ratios" Flash Animation Courseware for Ratios and Proportions This courseware is a teaching material for the second unit of the sixth grade mathematics volume of the Hebei Education Edition Basic Properties of Ratios and Simplified Ratios Flash Animation Courseware, with vivid content , please download! Key words:..
"Mixing Cement and Sand" Ratio and Proportion Flash Animation Courseware:
"Stirring Cement and Sand" Flash Animation Courseware on Ratios and Proportions This courseware is a teaching material on ratios and proportions in the second unit of the sixth grade mathematics volume of the Hebei Education Edition. Flash animation courseware on mixing cement and sand. The content is vivid and vivid. Please download it! Keywords: ratio and proportion teaching courseware, stir...
File Info
Update Time: 2024-10-20
This template belongs to Mathematics courseware Qingdao Edition Eighth Grade Mathematics Volume 1 industry PPT template
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