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Authoritative PPT Summary
"Rational Numbers" PPT Courseware 7
Knowledge review
After the introduction of negative numbers, the range of numbers expanded. Now ask the students to write 3 different types of numbers on the scratch paper.
group discussion
Observe the numbers written by group members and classify them.
How do you divide it?
Classification of numbers
Question 1: Observe the following 9 numbers and classify them.
5, 5.6, -6, -3.7, 0, 3, -2, 3/2, -1/2
Positive integers: 5, 3…
Zero: 0.
Negative integers: -6, -2
Positive scores: 5.6, 3/2…..
Negative points: -3.7, -1/2…..
practise
1. Write down three rational numbers at will, tell what type of numbers they are, and communicate with your peers.
2. Fill in each of the following numbers into the circle of the set it belongs to:
15,-1/9, -5,2/15,-13/8, 0.1, -5.32, -80, 123, 2.333.
Class summary
The numbers we have learned so far are all rational numbers (except pi). Rational numbers can be classified according to different standards. Different standards lead to different classification results.
Expand
1. Is 0 an integer? Does a natural number have to be an integer? Does 0 have to be a positive integer? Does an integer have to be a natural number?
2. The two circles in the picture represent the set of positive integers and the set of integers respectively. Please write and fill in the overlapping part of the two circles. Can you tell what set of numbers this overlapping part represents?
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