"Understanding the Scale" Proportion PPT

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"Understanding the Scale" Proportion PPT

Part One: Review the past and learn the new

brain teasers

The distance from Beijing to Shanghai is about 1,200 kilometers, but it only takes 5 seconds for an ant to get from Beijing to Shanghai. Why is this?

Climb around the map.

Is the distance from Beijing to Shanghai on the map different from the actual distance?

Understanding scale PPT, part 2: exploration of new knowledge

scale

The ratio of the distance on the picture to the actual distance in a picture is called the scale of the picture.

Distance on the map � actual distance = scale

A distance of 1cm on the map is equivalent to an actual distance of 50km on the ground.

Change the line segment scale to a numerical scale.

Distance on the map: actual distance

=1 cm∶50 km

=1 cm:5000000 cm

=1:5000000

Think about it:

A scale of 1:5000000 indicates what fraction of the distance on the map is the actual distance? How many times the actual distance is the distance on the picture?

Understanding scale PPT, part 3: classroom exercises

fill in the blank.

(1) The scale of a picture is 1:3000000, which means that the distance of 1 cm on the picture is equivalent to the actual distance ( ), and the actual distance is ( ) times the distance on the picture.

(2) The scale of a picture is _______. It means that the distance in ( ) centimeters on the picture is equivalent to the actual distance ( ), and converting it into a numerical scale is ( ).

The height of a cylindrical part is 5mm, and the height on the drawing is 2cm. What is the scale of this drawing?

Distance on the map: actual distance = scale

2cm=20mm

20:5＝4:1

Answer: The scale of this drawing is 4:1.

Understanding scale PPT, Part 4: Class summary

scale

numerical scale

line segment scale

Distance on the map/actual distance = scale

Pay attention to the unified unit when calculating.

Keywords: Free download of PPT courseware for mathematics in the second volume of the sixth grade of the People's Education Press, download of PPT on understanding scales, download of proportion PPT, .PPT format;

For more information about the PPT courseware "Proportions and Understanding Scales", please click on the Proportions PPT and Understanding Scales PPT tab.

"Understanding the Scale" Scale PPT courseware:

"Understanding the Scale" Scale PPT Courseware Teaching Objectives 1. Combined with specific examples, experience the process of drawing according to 1:1 and reducing the drawing according to a certain ratio. 2. Understand the meaning of scale and be able to draw simple diagrams according to scale. 3. Actively participate in operational activities,...

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Update Time: 2024-09-30

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

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