"Opposite Numbers" Rational Numbers PPT Courseware

Description

"Opposite Numbers" Rational Numbers PPT Courseware

think

There are ____ points on the number axis whose distance from the origin is 2, and the number represented by these points is _______; there are ____ points whose distance from the origin is 5, and the number represented by these points is __________

induction

Generally speaking, assuming a is a positive number, there are two points on the number axis whose distance from the origin is a. They are respectively on the left and right of the origin, which means -a and a. We say that these two points are symmetrical about the origin.

concept

Like 2 and -2, 5 and -5, -0.5 and 0.5, two numbers with only different signs are called opposites of each other.

That is to say, the opposite of 2 is -2, and the opposite of -2 is 2; the opposite of 5 is -5, and the opposite of -5 is 5.

Summary of teaching activities

1. Key knowledge: The concept of mutually opposite numbers: like 2 and -2, 5 and -5, two numbers with only different signs are called mutually opposite numbers.

2. Important mathematical ideas: the idea of ​​combining numbers and shapes, and the idea of ​​classification.

3. Developed skills: Ability to find the opposite of a number.

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File Info

Update Time: 2024-08-22

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

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