"Absolute Value" Rational numbers and their operations PPT download

Description

"Absolute Value" Rational numbers and their operations PPT download

Part One: Introduction to Situation

A citizen of the Kingdom of Rational Numbers +1 accidentally fell into a magic bottle one day. Who would have thought that after coming out, he would turn into a chubby 0. Do you think it’s strange? 2, who was watching with cold eyes, said: "Who told his brother with the opposite number to sleep in this bottle? Fortunately, my brother is not in it!"

Do you want to know who is the opposite number brother of +1? Why did it change to 0 after they met?

Absolute value PPT, part 2: learning objectives

Use the number line to understand the concepts of opposites and absolute values, and be able to find the opposite and absolute value of a number.

The absolute value is used to compare the size of two negative numbers.

Consciously cultivate our confidence in learning mathematics and the courage to overcome difficulties, so as to experience the joy of success.

Absolute value PPT, the third part: preview presentation

1. What is the opposite number?

If two numbers differ only in sign, then we call one number the opposite of the other. In particular, the opposite of 0 is 0.

2. What is the relationship between the positions of mutually opposite numbers on the number axis?

Geometric characteristics of opposite numbers: On the number axis, two points representing opposite numbers are located on both sides of the origin and are equidistant from the origin.

3. What are the properties of opposite numbers?

(1) The opposite of a positive number is a negative number.

(2) The opposite of 0 is 0.

(3) The opposite of a negative number is a positive number.

Absolute value PPT, part 4: exploring new knowledge

Observe the picture below and answer the questions:

1. Definition of absolute value: On the number axis, the distance between the point corresponding to a number and the origin is called the absolute value of the number.

2. Use mathematical symbols to represent the absolute value of a number.

"The absolute value of +3 is equal to 3" is expressed as: │+3│=3

What about the absolute value of -3? │-3│=3

What about the absolute value of 0? │0│=0

The absolute value of a rational number a is expressed as: | a |

Absolute value PPT, part 5: cooperative exploration

(1) Express the following numbers on the number line and compare their sizes: -1.5, -3, -1, -5;

(2) Find the absolute value of each number in (1) and compare their sizes;

(3)What did you find?

Conclusion: (1) Use the number line to compare the magnitude of two negative numbers.

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

Absolute value PPT, Part 6: Testing in class

1. The opposite of 0 is _____, and the opposite of -2 is _____.

2. | -8 |=______, | 8 |=_____.

3. If | a |=5, then a= _______.

4. If |a+1|=0, then a=_______.

5, - 1 ___ - 5, - 0.9 ___ - 0.6;

6. The absolute value of a number is itself, then the number must be __________.

Absolute value PPT, part 7: assignments

1. Preview homework: The preview plan for "Addition of Rational Numbers" is completed.

2. Consolidate homework: The training case of "Classroom Refining" is completed.

3. Improvement work: (Completed by member No. 1 of each group)

Keywords: Free download of Beijing Normal University edition seventh-grade mathematics PPT courseware for volume 1, absolute value PPT download, rational numbers and their operations PPT download, .PPT format;

For more information about the "Rational Numbers and Their Operations Absolute Value" PPT courseware, please click the Rational Numbers and Their Operations PPT Absolute Value PPT tag.

"Absolute Value" Rational Numbers and Their Operations PPT:

"Absolute Value" Rational Numbers and Their Operations PPT Part One Content: Learning Objectives 1. Use the number axis to initially understand the concepts of opposites and absolute values; 2. Be able to find the opposite and absolute value of a number, and use absolute value to compare two negative numbers. The big...

"Absolute Value" Rational Numbers PPT (Lesson 2):

"Absolute Value" Rational Numbers PPT (Lesson 2) Part One: Learning Objectives 1. Master the method of comparing the size of rational numbers. (Key Points) 2. Be able to use the knowledge of the number axis and absolute value to compare the sizes of two rational numbers. (Difficulty) The new lesson introduces the altitude of Mount Everest...

"Absolute Value" Rational Numbers PPT (Lesson 1):

"Absolute Value" Rational Numbers PPT (Lesson 1) Part One Content: Learning Objectives 1. Understand the concept and properties of absolute values ​​(difficulty). 2. Be able to find the absolute value of a rational number (key points). The new lesson introduces two cars from Starting from the same point O, drive east and west respectively for 10..

File Info

Update Time: 2024-10-29

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

Preview