"Rational Numbers" PPT Courseware 6

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"Rational Numbers" PPT Courseware 6

Use your brain

1. Negative numbers: refer to numbers less than 0.

2. Positive number: a number greater than 0.

3. There is no maximum and minimum number

4. All negative numbers are smaller than natural numbers.

We often encounter such problems in life:

1. If the income of 100 yuan is expressed as 100 yuan, can the expenditure of 100 yuan be expressed as 100 yuan?

2. If the temperature is 5℃ above zero, it is expressed as 5℃. Then, can the temperature of minus 5℃ be expressed as 5℃? Why?

1. Practice

2.Communication and discovery

Please read pages 28 and 29 of the textbook and try to solve the questions raised in the textbook. And complete a few questions:

1. Give an example to explain what are positive and negative numbers?

2. Is 0 a positive number or a negative number?

3. Can you use positive and negative numbers to express quantities with opposite meanings? for example.

4. What are integers, fractions, and rational numbers?

5. Can you classify the numbers you have learned?

10, -5, 0.23, -0.23, 11.5, 0, -3.5, -1, -13

∏，3.333… , -∏, -2.040404…，3/5,-7/8,8/8,

Integers: 10, -5, 0, -1, -13

Positive numbers: 10, 0.23, 11.5, ∏, 3.333…, 3/5, 7/8

Negative numbers: -5, -0.23, -5.3, -1, -13, -∏, -2.040404…, -7/8

Positive scores: 3/5,8/8

Negative score: -7/8

Homework: Exercise after class

Mathematically, real numbers are intuitively defined as numbers that correspond to points on the number line.

Real number classification:

Classification by nature is: positive numbers, negative numbers, 0;

The classification by definition is: rational numbers and irrational numbers.

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Update Time: 2024-09-28

This template belongs to Mathematics courseware Qingdao Edition Seventh Grade Mathematics Volume 1 industry PPT template

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