"Number Axis" Rational Numbers and Their Operations PPT Teaching Courseware

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"Number Axis" Rational Numbers and Their Operations PPT Teaching Courseware

Part One: Situation Import

1. Review: Can you tell me what a positive number is and what a negative number is?

2. Question: (1) Thermometer is an important tool used to measure temperature in our daily life. Please try to read the temperature displayed on the three thermometers in the picture?

(2) What are the characteristics of the scale numbers on the thermometer?

The scales are all marked on a straight line; one point represents 0℃; the scale above 0℃ represents the temperature above zero, and the scale below 0℃ represents the temperature below zero, that is, the scale indicates that the temperature has directionality; the scale is uniform, and the distance between adjacent scales The distance is equal and so on.

(3) Can you learn from the thermometer and use points on a straight line to represent rational numbers?

Number line PPT, part 2: problem exploration

Question 1: Can you draw a number line?

Draw a horizontal straight line, pick a point on the straight line to represent 0 (called the origin), select a certain length unit as the unit length, and stipulate that the right direction on the straight line is the positive direction, and you will get the following number axis.

There are three elements of a number axis: origin, unit length, and positive direction.

Question 2: Please think about: Where are +3, -4, and 0 respectively on the number axis?

On the number line,

+3 can be represented by a point 3 units long to the right of the origin,

-4 can be represented by a point 4 units long to the left of the origin, and 0 can be represented by the origin.

Any rational number can be represented by a point on the number line.

Number axis PPT, the third part: a quick test

1. Do the following figures represent the number axis correctly? Why?

2. Point out what numbers A, B, C, and D on the number axis represent.

3. Use points on the number line to represent each of the following numbers.

3, -2, 1.5,-3/4, 0,-0.5

Can you connect them with ">"?

Number axis PPT, part 4: Consolidation and improvement

1. The point representing -2 on the number line is on the ______ side of the origin, and the distance from the origin is ____________. The point representing 6 is on the _____ side of the origin, and the distance from the origin is ____________.

2. If point P is on the number axis and the distance to the origin is 5 units, then the number represented by point P is __________.

4. What number is represented by a point 3 units long from the origin on the number axis? What number is 3 units distant from the point representing the number 2?

5. Point A is 3 units long from the origin on the number axis and is located to the left of the origin. If an ant moves 4 units to the right from point A and then 1 unit to the left, the position of the ant at this time What number does it represent?

Question to think about: The number represented by a point on the number axis is -5. This point first moves 3 units to the left, and then moves 6 units to the right. What is the number it represents at this time? If according to the above movement rule, the number represented by the final point is 2, what number does it represent at the beginning?

Number line PPT, Part 5: Class summary

1. What mathematical knowledge did I learn in this lesson?

2. What mathematical methods did I learn in this lesson?

Homework: Exercise 2.2

Keywords: Free download of Beijing Normal University Edition seventh-grade mathematics PPT courseware, volume axis PPT download, rational numbers and their operations PPT download, .PPT format;

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

"Number Axis" Rational numbers and their operations PPT download:

"Number Axis" Rational Numbers and Their Operations PPT Download Part One: Thinking What are the characteristics of the scale on the thermometer? The intervals between each scale are equal. Each scale represents a degree. With 0℃ as the dividing point, the upward temperature is greater than zero and the downward temperature is less than zero..

"Number Axis" Rational numbers and their operations PPT:

"Number Axis" Rational Numbers and Their Operations PPT Part One Content: Learning Objectives 1. Understand the concept of the number axis and its three elements, and be able to draw the number axis. (Key points) 2. Understand the correspondence between the points on the number axis and rational numbers, and be able to use the number axis to compare The size of rational numbers. (Difficulty) ... ...

"Number Axis" Rational Numbers PPT:

"Number Axis" Rational Numbers PPT Part One Content: Learning Objectives 1. Master the concept of the number axis and understand the correspondence between the points on the number axis and rational numbers. (Key Points) 2. Be able to draw the number axis correctly and use the points on the number axis to represent rational numbers. ( Difficulty) ... ... ... number line..

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Update Time: 2024-11-20

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

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