"Absolute Value" Rational Numbers and Their Operations PPT Courseware 2

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"Absolute Value" Rational Numbers and Their Operations PPT Courseware 2

What is a number line?

A straight line that specifies the origin, positive direction, and unit length.

What is the opposite number?

Only two numbers with different signs are opposites of each other.

Rule: The opposite of 0 is 0.

The distance from the corresponding point of a number on the number axis to the origin is called the absolute value of the number, represented by "| |".

The distance from -5 to the origin is 5, so the absolute value of -5 is 5, recorded as |-5|=5

The distance from 0 to the origin is 0, so the absolute value of 0 is 0, recorded as |0|=0

The distance from 4 to the origin is 4, so the absolute value of 4 is 4, which is recorded as |4|=4

judge:

1. The number with the smallest absolute value is 0. ( )

2. The absolute value of a number must be a positive number. ( )

3. The absolute value of a number cannot be negative. ( )

4. Two numbers that are opposite to each other must have the same absolute value. ( )

5. The greater the absolute value of a number, the closer its point is to the origin on the number axis. ( )

What did you learn in this lesson? ? ?

(1) The concept of absolute value.

(2) How to find the absolute value of a number.

(3) The absolute value of a number is always greater than or equal to 0.

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Update Time: 2024-11-05

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