"Happy Football" PPT courseware

Description

"Happy Football" PPT courseware

teaching objectives

1. Understand the scale and be able to find the scale of a picture based on its meaning.

2. Can calculate the distance on the map and the actual distance.

3. Understand the similarity of graphics and cultivate the concept of space.

4. Cultivate problem awareness and problem-solving abilities based on actual practice.

review

fill in the blank.

1 kilometer = ( ) meter 1 decimeter = ( ) centimeter

1 meter = ( ) decimeter 1 centimeter = ( ) millimeter

30 meters = ( ) centimeters 300 centimeters = ( ) decimeters

15 kilometers = ( ) centimeters 40 millimeters = ( ) centimeters

example

Design a factory building and use a distance of 10 centimeters on the plan to represent a distance of 10 meters on the ground. Find the ratio of the distance on the graph to the actual distance.

To ask for the ratio of the distance on the picture to the actual distance, can we directly use the two sequence equations given in the question? Why? What should I do?

Because the distance on the map has different units than the actual distance, it cannot be expressed directly.

10 meters = 1000 centimeters

10∶1000＝1∶100

Answer: The ratio between the distance on the picture and the actual distance is 1:100.

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

Distance on the map: actual distance = scale

Distance on the map/actual distance = scale bar

emphasize

(1) The scale bar is different from the general ruler. It is a ratio and should not have a unit of measurement.

(2) When calculating the scale, the unit lengths of the front and back items must be converted into units of the same level.

(3) The first term of the scale should generally be simplified to "1".

Do it

Which of the following passages are scales and which are not? Why?

Draw a rectangle 20 meters long and 10 meters wide on the drawing paper. The length is 5 centimeters and the width is 2.5 centimeters.

(1) The ratio of the length in the picture to the actual length is 1/400. ()

(2) The ratio of the width on the picture to the actual width is 1:400. ( )

(3) The ratio of the area on the picture to the actual area is 1:160000. ( )

(4) The ratio of the actual length to the length on the picture is 400:1. ( )

Summary of the whole lesson

Ability to calculate map distances and actual distances based on scale.

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"Happy Football" PPT courseware 3:

"Happy Football" PPT courseware 3 The significance of the scale Football field: 95 meters long, 60 meters wide 9.5 meters = 9500 cm 60 meters = 6000 cm 9.5:9500=1:1000 6:6000=1:1000 The distance on the picture and the actual distance Ratio is called the scale of this picture. The distance on the picture...

"Happy Football" PPT courseware 2:

"Happy Football" PPT Courseware 2 Learning Objectives 1. Understand the scale and be able to find the scale of a picture based on its meaning. 2. Can calculate the distance on the map and the actual distance. 3. Understand the similarity of graphics and cultivate the concept of space. 4. Cultivate problem awareness and reconciliation based on actual conditions.

File Info

Update Time: 2024-11-25

This template belongs to Mathematics courseware Qingdao Edition Sixth Grade Mathematics Volume 2 industry PPT template

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