| Category | Format | Size |
|---|---|---|
| Qingdao Edition Seventh Grade Mathematics Volume 1 | pptx | 6 MB |
"Multiplication and Division of Rational Numbers" PPT courseware
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"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 together, the positions of the factors are swapped, and the products are equal. That is a×b=b×a.
2.Associative law of multiplication
To multiply three rational numbers, you can arbitrarily exchange the positions of the factors, or multiply two of the factors first.
(a×b)×c=a×(b×c)
3. Distribution rate
Multiplying a number by the sum of two numbers is equivalent to multiplying the number by the two numbers and then adding the products.
(a+b)×c=a×c+b×c
4. When several numbers that are not equal to 0 are multiplied together, the sign of the product is determined by the number of negative factors. When there is an odd number of negative factors, the product is negative; when there is an even number of negative factors, the product is positive.
When multiplying multiple rational numbers, you can first determine the sign of the product, and then multiply the absolute values of each factor.
When multiplying several rational numbers, if one factor is 0, the product is 0.
Operation
Required questions: Textbook P60 Group A, Questions 3 and 4
Optional questions: Textbook P60 Group B Question 2
Keywords: Teaching courseware for multiplication and division of rational numbers, Qingdao edition seventh grade mathematics volume PPT courseware download, seventh grade mathematics slide courseware download, multiplication and division of rational numbers PPT courseware download, .PPT format;
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Update Time: 2024-07-08
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