| Category | Format | Size |
|---|---|---|
| Beijing Normal University seventh grade first volume mathematics | pptx | 6 MB |
"Subtraction of Rational Numbers" Rational Numbers and Their Operations PPT Courseware
Description
"Subtraction of Rational Numbers" Rational Numbers and Their Operations PPT Courseware
Review calculations
(1) 4 + 16=
(2)(–2)+(–27)=
(3) (–9) + 10 =
(4) 45 + (–60) =
(5) (–7) + 7 =
(6) 16 + 0 =
(7) 0 + (–8) =
(1) To add two numbers with the same sign, take the same sign and add the absolute values.
(2) To add two numbers with different signs whose absolute values are not equal, take the sign of the addend with the larger absolute value, and subtract the smaller absolute value from the larger absolute value. Add two numbers that are opposites of each other. Got 0.
(3) If you add a number to 0, you still get this number.
Question 1
(1) (+10)-(+3)=
(2) (+10)+(-3)=
So we get: (+10)-(+3)=(+10)+(-3)
What are the characteristics of this equation? What do students understand about subtraction from equations?
Answer: The left side of the equation is the subtraction operation, and the right side is the addition operation. The subtraction operation is converted into an addition operation.
Can all subtractions be converted into addition operations?
Question 2
(1)(–2)+(–8)=
(2)(–10)–(–8)=
(3) (–10) + ( +8 ) =
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"Subtraction of Rational Numbers" PPT courseware:
"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 in Harbin...
"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..
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Update Time: 2024-07-04
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