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"Multiplication of Rational Numbers" Rational Numbers PPT Courseware 2
We are already familiar with the multiplication operation of positive numbers and 0. After introducing negative numbers, how to perform the multiplication operation of rational numbers?
(1) If the snail keeps crawling to the right at a speed of 2CM per minute, where will it be after 3 minutes?
(2) If the snail keeps crawling to the left at a speed of 2CM per minute, where will it be after 3 minutes?
(3) If the snail keeps crawling to the right at a speed of 2CM per minute, where was it three minutes ago?
(4) If the snail has been crawling to the left at a speed of 2CM per minute, where was it three minutes ago?
Rules: To the left is negative, to the right is positive. Now the front is negative, now the back is positive.
Observe equations (1)-(4) and fill in the blanks based on your thoughts on multiplication of rational numbers:
The product of a positive number multiplied by a positive number is _____ number;
The product of a negative number times a positive number is _____ number;
The product of a positive number times a negative number is _____ number;
The product of a negative number multiplied by a negative number is _____ number;
The absolute value of the product is equal to ____ of the absolute value of each multiplier.
Determine the sign of the following product:
(1) 5×(-3) The sign of the product is negative
(2) The sign of (-4)×6 product is negative
(3) The sign of the (-7) × (-9) product is positive
(4) The sign of the product of 0.5×0.7 is positive
summary:
1. Rules for multiplication of rational numbers:
When two numbers are multiplied together, the numbers with the same sign will be positive, and the numbers with different signs will be negative. If the absolute values are multiplied together, any number multiplied by 0 will get 0.
2. How to perform operations on two rational numbers:
First determine the sign of the product, and then multiply the absolute values. When one factor is zero, the product is zero.
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"Multiplication of Rational Numbers" Rational Numbers PPT Courseware 3:
"Multiplication of Rational Numbers" Rational Number PPT Courseware 3 The multiplication laws learned in primary school are still applicable in the multiplication of rational numbers. Use letters to express the exchange rate of multiplication: ab=ba. Use letters to express the combination rate of multiplication: (ab)c=a(bc) Application Multiplication rate calculation (1) (-25) 3..
"Multiplication of Rational Numbers" Rational Numbers PPT courseware:
"Multiplication of Rational Numbers" Rational Numbers PPT Courseware Generally speaking, multiplying a number by the sum of two numbers is equivalent to multiplying this number by the two numbers respectively, and then adding the products. Distributive law: a(b+c)= ab+ac Compare the above two solutions, what are the differences between them in the order of operations?