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

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

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The addition rule of rational numbers

1. The result of calculating (-3)+(-2) is (B)

A.5 B.-5 C.1 D.-1

2. In the following steps of adding two numbers with different signs, the error (C)

① Find the absolute value of two rational numbers;

②Compare the absolute values ​​of two rational numbers;

③ Take the sum of the absolute values ​​of two rational numbers as the absolute value of the result;

④The symbol with the larger absolute value is used as the symbol of the result.

A.① B.② C.③ D.④

3. The sign of (-1)+(-2) is negative, the sign of (+8)+(-6) is positive, the sign of (-8)+(+6) is negative. (Fill in " "Positive" or "Negative" )

Knowledge point 2: Addition of rational numbers

4. Among the following operations, the correct one is (B)

A.( +3 )+( -8 )=-11

B.( +3 )+( -8 )=-5

C.( +3 )+( -8 )=+11

D.( +3 )+( -8 )=+5

5. Calculation:

(1)28+(-12);

Knowledge point 3: General application of rational number addition

6. If a and 1 are opposite numbers to each other, then |a+1| is equal to (B)

A.-1 B.0 C.1 D.2

7. The positions of rational numbers a and b on the number axis are as shown in the figure, then the value of a+b (B)

A. Greater than 0 B. Less than 0

C. Less than a D. Greater than b

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

10. Which of the following statements is correct (D)

A. The sum of two addends must be greater than each addend.

B. The sum of two numbers must be less than each addend

C. The sum of two numbers must be between these two numbers

D. All of the above are possible

11. Our country is the first country to recognize negative numbers and perform related operations. In the ancient mathematics masterpiece "Nine Chapters of Arithmetic", the method of using arithmetic chips to implement "positive and negative operations" is recorded. Figure 1 shows the calculation of 3+( -4) process. According to this method, the process shown in Figure 2 should be calculating (C)

Addition of rational numbers PPT, the third part: Expanding exploration and breakthroughs

20. Observing Figure 1, can you find any patterns between the numbers? Please briefly describe this pattern and fill in the appropriate numbers in the blanks in Figure 2 according to this pattern.

Solution: The rule discovered is: the sum of the two numbers on the adjacent sides of the black box below is equal to the number in the adjacent white box above the black box.

According to this rule, we get (-4)+(+12)=+8,(+12)+(-14)=-2,(+8)+(-2)=+6, thus we get the figure in Figure 2 The number in the blank box is as shown in the figure.

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

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

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

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

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"Addition of Rational Numbers" Rational numbers and their operations PPT (Lesson 1):

"Addition of Rational Numbers" Rational Numbers and Their Operations PPT (Lesson 1) Part One Content: Learning Objectives 1. Understand the meaning of addition of rational numbers and the rationality of the addition rule of rational numbers. 2. Be able to use this rule to accurately perform the addition operation of rational numbers. (Key point) 3. Sutra..

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Update Time: 2024-11-20

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