"Real Numbers" Real Numbers PPT download

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"Real Numbers" Real Numbers PPT download

Part One: Learning Objectives

1. Master the concept of real numbers and be able to classify them as required; be able to find the opposite, absolute value and reciprocal of real numbers;

2. Understand the one-to-one correspondence between real numbers and points on the number axis, and be able to locate irrational numbers on the number axis.

Real number PPT, part 2 content: pre-class preview test

1. The real number 0 is ( )

A. Rational numbers B. Irrational numbers

C. Positive number D. Negative number

2.The opposite number of √3-√2 is _______________, and the absolute value is ____________.

4. As shown in the figure, the numbers represented by the two points A and B on the number axis are and 5.1 respectively. Then there are total points representing integers between the two points A and B ( )

A. 6 B. 5 C. 4 D. 3

Real number PPT, the third part: knowledge explanation

Rational numbers and irrational numbers are collectively called real numbers

Definition: Real numbers can be divided into rational numbers and irrational numbers

2. Is 0 a positive number? Is 0 a negative number?

3. How else can real numbers be classified?

In the range of real numbers, the meanings of opposites, reciprocals, and absolute values ​​are exactly the same as those of opposites, reciprocals, and absolute values ​​in the range of rational numbers.

(1) a is a real number, its opposite is ______, and its absolute value is ______;

(2)If a ≠0, then its reciprocal is ______.

(3)The absolute value of a positive real number is______,

The absolute value of 0 is ______,

The absolute value of a negative real number is ______.

Real Number PPT, Part 4: Discussion

(1) As shown in the figure, what is the number corresponding to point A on the OA=OB number axis? What two integers is it between?

(2) Can you find the point corresponding to √5 on the coordinate axis? Communicate with peers.

Correspondence between real numbers and points on the number axis:

Every real number can be represented by a point on the number line; conversely, every point on the number line represents a real number. That is, there is a one-to-one correspondence between real numbers and points on the number line.

Example: As shown in the figure, the numbers represented by the two points A and B on the number axis are -1 and √3 respectively. The symmetry point of point B with respect to point A is C. Find the real number represented by point C.

Real Number PPT, Part 5: In-class Testing

1. Which of the following statements is correct ( )

A. There is no smallest real number B. Rational numbers are finite decimals

C. Infinite decimals are all irrational numbers D. Numbers with a root sign are all irrational numbers

2. Which of the following numbers is irrational ( )

A.0 B.-1 C. √2 D. 3/7

Real Numbers PPT, Part Six: Class Summary

Through the study of this class, we need to master:

1. Rational numbers and irrational numbers are collectively called real numbers.

2. Within the range of real numbers, the meanings of opposites, reciprocals, and absolute values ​​are exactly the same as those within the range of rational numbers.

Keywords: Beijing Normal University edition eighth grade mathematics PPT courseware free download, real number PPT download, .PPT format;

For more information about the "Real Numbers" PPT courseware, please click on the Real Numbers PPT tab.

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Update Time: 2024-11-22

This template belongs to Mathematics courseware Beijing Normal University Edition Eighth Grade Mathematics Volume 1 industry PPT template

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