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Authoritative PPT Summary
"Number Axis" PPT courseware
learning target:
1. Know the definition of a number line and be able to draw a number line;
2. Be able to represent known numbers on the number line, and be able to tell the numbers represented by the points on the number line that represent rational numbers;
3. Use the number axis to solve related problems and summarize the mathematical ideas and methods of "combination of numbers and shapes".
Study 1: What is a number line (5 minutes)
1. Ask students to complete tasks 1 and 2 by themselves through preview
2. Summarize the steps for making a number axis, draw the number axis on the blackboard and explain how to do it.
3. Bonus points will be given to the group that takes the stage to explain.
Summary:
Definition: A straight line that specifies the origin, unit length and positive direction is called a number axis.
illustrate:
①The origin, unit length and positive direction are indispensable.
②The unit length must be uniform.
③No arrow in negative direction
Explore 2. How to use the number line as a tool
1. Complete the three questions in Task 1 by yourself
2. After completion, the team will present on stage and be awarded points.
Explore three, expand and improve
This module contains three tasks, please complete them by yourself
After completion, the group will explain and award points.
summary
There are two points that are equidistant from a point and are symmetrical about the point
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