"Positive and Negative Numbers" Rational Numbers PPT Courseware 3

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"Positive and Negative Numbers" Rational Numbers PPT Courseware 3

Does 0 just mean none?

1. The number of gold coins in the empty jar;

2. 0℃ in temperature;

3.Height of sea level;

4. Standard water level;

5. The benchmark for height comparison;

6. The boundary between positive and negative numbers;

...0 is just a benchmark, it has rich meanings, it does not simply mean nothing.

Example (2) In 2001, the changes in the total merchandise import and export volume of the following countries compared with the previous year were: the United States decreased by 6.4%, Germany increased by 1.3%, France decreased by 2.4%, the United Kingdom decreased by 3.5%, Italy increased by 0.2%, and China increased by 7.5% %. Write down the growth rate of the total import and export of goods in these countries in 2001

Solution: The growth rate of total merchandise imports and exports of six countries in 2001:

United States -6.4%, Germany 1.3%,

France -2.4%, UK -3.5%,

Italy -0.2%, China 7.5%.

Summarize

How to use positive and negative numbers to represent quantities with opposite meanings?

A positive number is used to represent a quantity of one meaning, and the other quantity is represented by a negative number; in particular, when a positive or negative number represents the amount of change in a specified direction, the amount of change in the specified direction is usually defined as a positive number, and the amount of change in the specified direction is usually defined as a positive number. The amount of change in the opposite direction to the specified direction is specified as a negative number.

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"Positive and Negative Numbers" Rational Numbers PPT Courseware 2:

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Update Time: 2024-09-08

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 1 industry PPT template

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