Western Normal University Edition First Grade Mathematics Volume 1
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Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Qingdao Edition Seventh Grade Mathematics Volume 1
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People's Education High School Mathematics Edition B Compulsory Course 2
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Category | Format | Size |
---|---|---|
Hebei Education Edition Seventh Grade Mathematics Volume 1 | pptx | 6 MB |
Description
"Subtraction of Rational Numbers" PPT courseware
Question 1: The highest temperature in Hohhot in one day is 19 ℃, and the lowest temperature is 7 ℃. What is the temperature difference in Hohhot during this day? How to calculate?
Question 2: The highest temperature in Xiamen is 9 ℃ and the highest temperature in Harbin is -7 ℃. How many degrees Celsius is the highest temperature in Xiamen higher than the highest temperature in Harbin on this day? How can it be calculated?
Question 3: The highest temperature in Harbin is -7℃ and the lowest temperature is -12℃. What is the temperature difference in Harbin today? How did you calculate it?
Method 1: It can be seen from the figure that 9-(-7)=16
Method 2: According to the fact that subtraction is the inverse operation of addition, from (-7)+16=9, we also get 9-(-7)=16
Calculate the following equations:
50-20=__________, 50+(-20)=____;
50-10=__________, 50+(-10)=___________;
50-0=___________, 50+0=______;
50-(-10)=______, 50+10=_____;
50-(-20)=___,50+20=______.
What conclusion can you draw by comparing the two equations in each row?
subtraction rule for rational numbers
Subtracting a number is equal to adding the opposite of that number
a-b=a+(-b)
Example 1. Calculate the following questions:
(1)5-(-5) (2)0-7-5
(3)(-1.3)-(-2.1) (4)11/3-21/2
Solution: (1)5-(-5)=5 + 5= 10
(2)0-7-5=0+(-7)+(-5)=-7+(-5)=-12
(3)(-1.3)-(-2.1)=(-1.3)+2.1=2.1-1.3=0.8
Practice in class:
1. Oral calculation:
(1)3-5=__; (2)3-(-5)=__;
(3)(-3)-5=_____; (4)(-3)-(-5)=____;
(5)-6-(-6)=____; (6)-7-0=__;
(7)0-(-7)=_____; (8)(-6)-6=____;
(9)9-(-11)=__;
1. It is known that the sum of a number and 3 is -10, find this number.
2. fill in the blank
⑴-9+( )=16; ⑵42+( )=-25;
⑶( )-(-18)=35; ⑷( )-87=-21
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"Subtraction of Rational Numbers" Rational Numbers and Their Operations PPT Courseware 2:
"Subtraction of Rational Numbers" Rational Numbers and Their Operations PPT Courseware 2 The highest temperature in Urumqi is 4 degrees, and the lowest temperature is 3 degrees (1) What is the temperature difference in Urumqi today? List the equations. Tip: Since subtraction is the inverse operation of addition, 4 - (-3) is required..
"Subtraction of Rational Numbers" Rational numbers and their operations PPT courseware:
"Subtraction of Rational Numbers" Rational Numbers and Their Operations PPT Courseware Review Calculation (1) 4 + 16= (2) (2) + (27) = (3) (9) + 10 = (4) 45 + (60) = ( 5) (7) + 7 = (6) 16 + 0 = (7) 0 + (8) = (1) ..
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Update Time: 2024-10-01
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