"Subtraction of Rational Numbers" Rational Numbers PPT Courseware

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"Subtraction of Rational Numbers" Rational Numbers PPT Courseware

Exploring the Rule of Rational Subtraction

Practical problems sometimes involve the subtraction of rational numbers. For example, the temperature in a certain place for a day is -3~4℃, and the temperature difference on that day (maximum temperature minus minimum temperature, unit: ℃) is 4-(-3), here Use subtraction of positive and negative numbers.

Subtraction is the opposite operation to addition. To calculate 4-(-3), you need to find a number x such that the addition of x and -3 gives 4. Because the addition of 7 and -3 gives 4, x should be 7, that is

4-(-3)=7 ①

On the other hand, we know

4+(+3)=7 ②

From ①②

4-(-3)=4+(+3)③

How to perform mixed operations of addition and subtraction of rational numbers

Calculate (-20)+(+3)-(-5)-(+7)

Analysis: There are additions and subtractions in this formula. According to the rational number subtraction rule, it can be rewritten as

(-20)+(+3)+(+5)+(-7)

Transform the problem into the addition of several rational numbers.

Solution: (-20)+(+3)+(+5)+(-7)

=(-20)+(+3)+(+5)+(-7)

=[(-20)+(-7)]+[(+5)+(+3)]

=(-27)+(+8)

=-19

summary

Rule for subtraction of rational numbers:

Subtracting a number is equal to adding its opposite.

The rational number subtraction rule can also be expressed as

a-b=a+(-b)

Use the rules correctly and make accurate calculations

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For more information about the PPT courseware "Subtraction of Rational Numbers and Rational Numbers", please click the Rational Numbers ppt Subtraction of Rational Numbers ppt tag.

"Subtraction of Rational Numbers" Rational Numbers PPT Courseware 3:

"Subtraction of Rational Numbers" Rational Numbers PPT Courseware 3 Think about it. The highest temperature in Harbin is 3 degrees and the lowest temperature is 3 degrees. Question 1 What is the temperature difference in Harbin today? List the equations. 3 - ( - 3) = ? Question 2: What number plus -3 equals 3? 6+(-3..

"Subtraction of Rational Numbers" Rational Numbers PPT Courseware 2:

"Subtraction of Rational Numbers" Rational Numbers PPT Courseware 2 You can practice: 50 20 = 50+ (-20) = 50 10 = 50+ (-10) = 50 0 = 50 + 0 = 50 (-10) = 50+ ( +10) = 50 (-20) = 50+ (+20) = Calculate (1) (-32) (+5) (2)..

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Update Time: 2024-11-21

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

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