"Absolute Value" Rational Numbers PPT Courseware 2

Description

"Absolute Value" Rational Numbers PPT Courseware 2

Concept: The distance between the point representing the number a and the origin on the number axis is called the absolute value of the number a, recorded as |a|.

The absolute value of a positive number is

The absolute value of a negative number is its

The absolute value of 0 is 0

(1) When a is a positive number, |a|=a

(2) When a is a negative number, |a|=-a

(3) When a is 0, |a|=0

think

We already know how to compare two positive numbers (or 0), such as 0<1, 1<2, 2<3,….

How to compare any two rational numbers (such as -4 and -3, -2 and 0, -1 and 1)?

It is stipulated on the number axis that when rational numbers are represented on the number axis, their order from left to right is the order from small to large, that is, the number on the left is smaller than the number on the right.

Looking at the number line above, can you figure out how to compare the sizes of rational numbers?

(1) Positive numbers are greater than 0, 0 is greater than negative numbers, and positive numbers are greater than negative numbers;

(2) When two negative numbers are compared, the one with a larger absolute value is smaller.

summary

1 What knowledge was acquired?

It is stipulated on the number axis that when rational numbers are represented on the number axis, their order from left to right is from small to large, that is, the number on the left is smaller than the number on the right.

(1) Positive numbers are greater than 0, 0 is greater than negative numbers, and positive numbers are greater than negative numbers;

(2) Two negative numbers, the one with a larger absolute value is smaller.

2. What are the important ideas in mathematics in this lesson?

3 Reflect on what else you are not confused about

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Update Time: 2024-10-02

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

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