"Division of Rational Numbers" Rational Numbers and Their Operations PPT Courseware 2

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"Division of Rational Numbers" Rational Numbers and Their Operations PPT Courseware 2

teaching objectives:

1. Understand the rules of rational number division and be able to perform rational number division operations.

2. Be able to find the reciprocal of rational numbers.

When two numbers are multiplied together, the numbers with the same sign are positive, and the numbers with different signs are negative, and the absolute values ​​are multiplied together.

Any number multiplied by 0 gets 0.

During the operation, the sign of the product should be determined first.

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 several numbers are multiplied together, if one factor is 0, the product is 0.

think about it

Is the calculation below correct? If correct, please explain the reason; if incorrect, please correct:

15÷6÷2=15÷(6÷2)=15÷3=5

Solution: Because the commutative law and the associative law do not apply to division, it is incorrect. Correct it to

15 ÷ 6 ÷ 2 = 15/6 × 2 = 5/4

fill in the blank.

(1) The reciprocal of ________ is -2, and the reciprocal of -0.1 is ________.

(2) The reciprocal of -6 is ________, and the opposite is ________.

(3) The countdown of ________ is equal to itself. The opposite number of _________ is equal to itself. The absolute value of __________ is equal to it itself.

(4) If the opposite number of a number is equal to the countdown of this number, then this number is _________.

There are rational numbers divided by law:

Dividing a number is equal to multiplying it by its reciprocal.

If two numbers are divided, the numbers with the same sign will be positive, and the numbers with different signs will be negative, and the absolute values ​​will be divided.

Divide zero by any number that is not equal to zero, and you get zero.

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"Division of Rational Numbers" Rational numbers and their operations PPT download:

"Division of Rational Numbers" Rational Numbers and Their Operations PPT Download Part One: Learning Objectives 1. Understand the division rules of rational numbers and be able to perform division operations of rational numbers. 2. Understand the relationship between division and multiplication, and be able to find the reciprocal of a number. 3. Cultivate students to observe,...

"Division of Rational Numbers" Rational numbers and their operations PPT:

"Division of Rational Numbers" Rational Numbers and Their Operations PPT Part 1 Content: Knowledge Points Basic Knowledge Point 1 Find the reciprocal of a number 1. (Adapted) -The reciprocal of 1/6 is (A) A.-6 B.6 C.- 1/6 D.1/6 2. Which of the following statements is correct (D) A. Negative numbers are not reversed..

"Division of Rational Numbers" Rational Numbers PPT Courseware:

"Division of Rational Numbers" Rational Numbers PPT Courseware Part One Content: Introduction of New Knowledge Questions Introduction When we learned the subtraction of rational numbers earlier, we used the inverse operation to convert it into addition. Everyone knows that the inverse operation of division is multiplication, so the rational numbers of..

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Update Time: 2024-10-20

This template belongs to Mathematics courseware Beijing Normal University Edition Seventh Grade Mathematics Volume 1 industry PPT template

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