"Positive and Negative Numbers" Rational Numbers PPT Courseware 2

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"Positive and Negative Numbers" Rational Numbers PPT Courseware 2

What is a negative number?

We call numbers with "-" in front of them negative numbers, so why do we introduce negative numbers? What quantities do we usually use positive numbers and negative numbers to represent in our daily life? Let's understand with the video below.

practise

80m means walking 80m eastward, then -60m means ______.

If the water level rises by 3m, the water level change is recorded as +3m, then the water level drops by 3m, the water level change is recorded as ______ m. When the water level does not rise or fall, the water level change is recorded as ______ m.

The average daytime temperature on the moon's surface is 126°C above zero, recorded as ______ °C, and the average nighttime temperature is minus 150°C, recorded as ______ °C.

Extended questions

In a certain year, a country has a foreign debt of 1 billion US dollars and a domestic debt of 1 billion US dollars. Apply mathematical knowledge to explain. The following statement is reasonable: ( )

A. If the external debt is -1 billion U.S. dollars, the domestic debt is +1 billion U.S. dollars.

B. This country’s domestic debt and external debt offset each other.

C. The country owes a total of $2 billion in debt

D. There is no money in this country

Fill in the appropriate words on the following lines so that they form opposite meanings:

(1) Income 1,300 yuan, ______800 yuan;

(2)______80 meters, dropped 64 meters;

(3) Go north 30 meters, ______50 meters.

Observe the numbers in each column of the following arrangement, study the rules of its arrangement? And fill in the numbers in the blanks.

(1)1,-2,1,-2,1,-2,______,______,______,…

(2)-2,4,-6,8,-10,______,______,______,…

(3)1,0,-1,1,0,-1,______,______,______,…

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"Positive and Negative Numbers" PPT courseware:

"Positive and Negative Numbers" PPT courseware Self-introduction: My name is Liu Qing, I am 1.6cm tall, 30 years old, and weigh 51.5 kg. There are boys in our class. Which numbers appeared in the introduction just now? Can you classify them according to the number classification methods you have learned before? Integers and fractions..

"Positive and Negative Numbers" Rational Numbers PPT Courseware 3:

"Positive and Negative Numbers" Rational Numbers PPT Courseware 3 Does 0 only mean none? 1. The number of gold coins in the empty jar; 2. 0℃ in temperature; 3. The height of sea level; 4. Standard water level; 5. Height comparison Benchmark; 6. The boundary between positive and negative numbers; 0 is just a benchmark and it has rich...

"Positive and Negative Numbers" Rational Numbers PPT Courseware:

"Positive and Negative Numbers" Rational Numbers PPT Courseware Question 1: The weather forecast stated that the temperature in Beijing on a certain day in December 2003 was -3~3℃. What is its exact meaning? What is the temperature difference in Beijing on this day? The lowest temperature on this day was minus 3 degrees Celsius, recorded as -3 degrees Celsius. The highest...

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Update Time: 2024-11-25

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

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