"Direct Proportion and Inverse Proportion" General Review PPT Courseware

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"Direct Proportion and Inverse Proportion" General Review PPT Courseware

First, let’s give an example of what ratio is, what are the basic properties of ratio, and then talk about the practical problems that can be solved with the knowledge of ratio.

Fill in the following equations based on the relationship between ratio, fraction, and division, and talk about the connection between the basic properties of ratios, the basic properties of fractions, and the law of constant quotients.

How to determine whether two quantities are directly proportional or inversely proportional?

Give some examples of directly proportional or inversely proportional quantities in life

Work in pairs, measure each other, and do the math.

(1) Measure the head length and height, and calculate the ratio of head length to height.

(2) Measure the length of a unit and calculate the ratio of the length of the unit to the height.

(3) Measure the length of the feet and calculate the ratio of the length of the feet to the height.

The floor of a room is paved with floor tiles of two colors. (As shown below)

(1) Write the ratio of the paving areas of the two types of floor tiles and simplify it.

(2) If the area of ​​this room is 15 square meters, what is the floor area of ​​the two types of floor tiles?

The image below shows the relationship between distance traveled on the highway and fuel consumption of a car.

(1) Is the distance traveled by this car proportional to its fuel consumption? Why? Judging from the image, driving 75 kilometers consumes approximately one liter of fuel?

(2) If a car is driving in an urban area, it consumes 5 liters of fuel every 50 kilometers. Based on this fuel consumption, draw the corresponding points between driving 100 kilometers, 150 kilometers... and the fuel consumption in the picture above, and then They are connected in order.

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For more information about the PPT courseware "Direct Proportions and Inverse Proportions Jiangsu Education Edition Primary School Mathematics Volume 2 General Review" PPT courseware, please click the "Direct Proportions and Inverse Proportions ppt Jiangsu Education Edition Primary School Mathematics Volume 2 General Review ppt" tag.

"Direct Proportion and Inverse Proportion" PPT:

"Direct Proportion and Inverse Proportion" PPT Part One: Question Exploration 1. What is a directly proportional quantity? How should it be represented by letters? Two related quantities, if one quantity changes, the other quantity will also change. If the ratio of the two corresponding numbers in the two quantities is one...

"Letter Expressions of Proportional and Inverse Proportions" PPT:

"Letter Expressions of Direct Proportion and Inverse Proportion" PPT Part One Content: Teaching Objectives 1. Combined with specific examples, go through the process of reviewing the definitions of direct and inverse proportion, discussing problems and summarizing mathematical expressions. 2. Be able to judge common quantitative relationships between three quantities in a certain quantity..

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Update Time: 2024-10-01

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