"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT (Lesson 1)

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"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT (Lesson 1)

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"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT (Lesson 1)

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The multiplication rule of rational numbers

1. The correct number calculated by the following formula is (B)

①3×( -4 )=-12; ②( -4 )×( -6 )=24; ③( -5 )×( -1 )=-5; ④( -2 )×12=24.

A.1 B.2 C.3 D.4

2. If the product of two rational numbers is a negative number and the sum is also a negative number, then the two rational numbers (D)

A. Same sign and both are negative numbers

B. Different signs and the absolute value of a positive number is greater than the absolute value of a negative number

C. Same sign and both are positive numbers

D. Different signs and the absolute value of a negative number is greater than the absolute value of a positive number

3. Multiply any two numbers among the four numbers -2, 3, -4, and -5, and the product with the largest result is (A)

A.20 B.-20 C.10 D.8

Multiplication of rational numbers PPT, part 2: improvement of comprehensive ability

7. Which of the following statements is wrong (D)

A. The opposite number is itself 0

B. The reciprocal is -1 and 1

C. The number with the smallest absolute value is 0

D. Any rational number has a reciprocal

8. As shown in the figure, which of the following is correct (B)

A.a+b>0 B.a-b>0

C.ab>0 D.|b|<|a|

9. We use the operation of rational numbers to study the following problem. It is stipulated that the rising water level is positive and the falling water level is negative; it is positive a few days later and negative a few days ago. If the water level drops 4 cm every day, then the water level change after 3 days is calculated by the formula The correct representation is (C)

A.( +4 )×( +3 ) B.( +4 )×( -3 )

C.( -4 )×( +3 ) D.( -4 )×( -3 )

10. If the product of four unequal integers is 4, then the sum of these four numbers is (A)

A.0 B.6 C.-2 D.2

Multiplication of Rational Numbers PPT, Part 3: Expansion, Research and Breakthroughs

12. Specify a new operation "*". Two numbers a and b are calculated by "*" to obtain (a+2)×2-b, that is, a*b=(a+2)×2-b. For example, 3* 5=(3+2)×2-5=10-5=5. Answer the following questions according to the above regulations:

(1) Find the value of 7*(-3);

Are the values ​​of (2)7*(-3) and (-3)*7 equal?

Solution: (1)7*(-3)=(7+2)×2-(-3)=21.

(2) Because (-3)*7=[(-3)+2]×2-7=-9,

So the values ​​of 7*(-3) and (-3)*7 are not equal.

Keywords: Beijing Normal University edition seventh-grade mathematics PPT courseware free download, multiplication of rational numbers PPT download, rational numbers and their operations PPT download, .PPT format;

For more information about the "Rational Numbers and Their Operations Multiplication of Rational Numbers" PPT courseware, please click on the Rational Numbers and Their Operations PPT Multiplication of Rational Numbers PPT tag.

"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT Courseware (Lesson 2):

"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT Courseware (Lesson 2) Part One: Learning Objectives 1. Master the distributive law of multiplication and be able to use it flexibly. (Difficulty) 2. Master the law of operation of multiplication of rational numbers, and use Arithmetic laws simplify multiplication operations. (Emphasis...

"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT Courseware (Lesson 1):

"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT Courseware (Lesson 1) Part One: Learning Objectives 1. Master the multiplication rules of rational numbers and be able to perform operations skillfully. (Key Points) 2. Master the product of multiple rational numbers The Law of Symbols. (Difficulty) ... .....

"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT (Lesson 2):

"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT (Lesson 2) Part 1: Knowledge Points Basic Knowledge Point 1 Multiplication Law of Rational Numbers 1. Observe the calculation formula (-4)1/7(-25)28 in the problem-solving process The arithmetic law that makes calculations easier is (C) A..

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