"Number Axis" Rational Numbers PPT Courseware

Description

"Number Axis" Rational Numbers PPT Courseware

Demonstration production process:

1. Mark the position of the spring as 0 when no object is hung.

2. Mark and hang to determine the quality (eg: 100g)

3. Divide 0 to 100 into several equal portions (such as 10 equal portions, each portion is 10g)

Number line concept: Generally, in mathematics, people use drawings to "visualize" numbers. Numbers are usually represented by points on a straight line, which is called a number axis.

(1) Choose any point on the straight line to represent the number 0. This point is called the origin;

(2) It is usually specified that the positive direction on a straight line is from the origin to the right (or up), and the negative direction is from the origin to the left (or down);

(3) Select an appropriate length as the unit length. On the straight line from the origin to the right, take a point every other unit length to represent 1, 2, 3,...; from the origin to the left, use a similar method to represent -1, - 2,-3,…

Summary: A straight line that specifies the origin, positive direction, and unit length is called a number axis.

The three elements of a number axis: origin, positive direction, and unit length. (One of the three is indispensable)

Additional exercises:

(1) Draw a number line and indicate the following points: ±0.5, ±0.1, ±0.75.

(2) Draw a number line and indicate the following points: 1000, 5000, -2000.

(3) Mark all integers between -5 and +5 on the number line.

summary

(1) Number axis concept: Generally, in mathematics, people use drawings to "visualize" numbers. Points on a straight line are usually used to represent numbers, and this straight line is called a number axis.

(2) The three elements of the number axis: origin, positive direction, and length unit

(3) The relationship between numbers and shapes: a one-to-one correspondence.

(4) Mathematical thinking: the idea of ​​combining numbers and shapes.

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

"Number Axis" PPT courseware 3:

"Number Axis" PPT courseware 3 Learning objectives: 1. Understand the meaning of the number axis, clarify the three elements of the number axis, and be able to draw the number axis correctly. 2. Be able to tell the number represented by a known point on the number line; be able to express rational numbers as points on the number line. Independent learning 1...

"Number Axis" PPT courseware 2:

"Number Axis" PPT Courseware 2 Integers and fractions are collectively called rational numbers. Introduction There is a bus station on an east-west road. There are a willow tree and a poplar tree 3m and 7.5m east of the bus station respectively. 3m and 4.8m west of the bus station..

"Number Axis" PPT courseware:

"Number Axis" PPT courseware learning objectives: 1. Know the definition of a number axis, and be able to draw a number axis; 2. Be able to represent known numbers on a number axis, and be able to tell the numbers represented by points representing rational numbers on the number axis; 3 .Use the number axis to solve related problems and summarize the combination of numbers and shapes..

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Update Time: 2024-07-04

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

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