Western Normal University Edition First Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 1
People's Education Press First Grade Mathematics Volume 1
People's Education Press Second Grade Mathematics Volume 1
People's Education Press Third Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
Hebei Education Edition Third Grade Mathematics Volume 1
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
Qingdao Edition Seventh Grade Mathematics Volume 1
Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Hebei Education Edition Seventh Grade Mathematics Volume 2
People's Education High School Mathematics Edition B Compulsory Course 2
Beijing Normal University Edition Fifth Grade Mathematics Volume 2
Hebei Education Edition Fourth Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 2
Category | Format | Size |
---|---|---|
Hebei Education Edition Seventh Grade Mathematics Volume 1 | pptx | 6 MB |
Description
"Multiplication of Rational Numbers" PPT courseware
4 × 7 = 28
3 × 0 = 0
5 × 2 × 7 = 70
6 × 9 × 0 × 4 = 0
(-3)×2=? (-3)×(-2)=?
think about it
2×3=6 (–2)×3= – 6
2×(–3)= – 6 (–2)×(–3)=6
When two numbers are multiplied together, if they have the same sign, they get ____, if they have different signs, they get ____, and when they multiply their absolute values;
0 multiplied by any number gives ____.
Use your brain: Can you calculate the multiplication of several rational numbers?
2×3×4× (-5)=_____
2×3×(-4)×(-5)=_____
2×(-3)×(-4) ×(-5)=_____
(-2)×(-3)×(-4)×(-5)=_____
We know by observation
When several numbers other than 0 are multiplied together and the number of negative factors is an even number, the product is a positive number;
When the number of negative factors is odd, the product is negative.
Example 3 Calculation:
(1) (-5) × 8 × (- 7) × (- 0.25)
(2) 7.8×(-8.1)×0×(-19.6)
Solution: (1) Original formula = - (5×8×7×0.25) = - 70
(2) Original formula = 7.8×8.1×0×19.6 = 0
Little discovery:
When several numbers are multiplied together, if any of the factors is 0, the product equals ____.
Class summary
Rational multiplication rule
When two numbers are multiplied together, the numbers with the same sign are positive, the numbers with different signs are negative, and the absolute values are multiplied together.
When any number is multiplied by 0, the product is still 0.
Keywords: Multiplication of rational numbers teaching courseware, Hebei Education Edition seventh grade mathematics volume PPT courseware download, seventh grade mathematics slide courseware download, multiplication of rational numbers PPT courseware download, .PPT format;
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"Multiplication and Division of Rational Numbers" PPT courseware:
"Multiplication and Division of Rational Numbers" PPT courseware Review the past and learn the new 1. Commutative law of multiplication When two numbers are multiplied, the positions of the factors are exchanged, and the products are equal. That is, ab=ba. 2. The associative law of multiplication: When multiplying three rational numbers, you can arbitrarily exchange the positions of the factors, or first put two of them...
"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT Courseware 3:
"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT Courseware 3 1. Answer the following questions 1. The rules for addition of rational numbers are divided into several situations, and how are they defined? 2. What is the subtraction rule for rational numbers? 3. The multiplication rule of rational numbers is divided into several situations and how...
"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT Courseware 2:
"Multiplication of Rational Numbers" Rational Numbers and Their Operations PPT Courseware 2 Review and Thoughts 1. What is the rule of multiplication of rational numbers? 2. How to perform multiplication of rational numbers? 3. What arithmetic laws of multiplication did you learn in elementary school? Learned: Commutative law of multiplication, associative law of multiplication..
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Update Time: 2024-10-21
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