"Addition of Rational Numbers" Rational Numbers and Their Operations PPT Courseware

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"Addition of Rational Numbers" Rational Numbers and Their Operations PPT Courseware

review

1. If walking 5 meters to the east is recorded as +5 meters, then walking 3 meters to the west is recorded as ＿＿.

2. It is known that a=-5, b=+3, �a�+�b�=＿＿

It is known that a=-5, b=+3, �a�-�b�=＿＿

1. The meaning of rational number addition

Walk 5 meters east, and then walk 3 meters east. How many meters did you walk east in total?

(+5)+(+3)=8

2. Types of rational number addition

1.5 + 3 = 8

2. (-5) + (-3) = - 8

3. (-3) + (-2) = - 5

4.5+(-3)=2

5.3+(-5)=-2

6.3+(-2)=1

7.5+(-5)=0

8.4+(-4)=0

3. Rational number addition rules

1. To add two numbers with the same sign, take the same sign and add the absolute values.

2. To add two numbers with different signs whose absolute values ​​are not equal, take the sign of the addend with the larger absolute value, and subtract the smaller absolute value from the larger absolute value. Two numbers that are opposites of each other add up to 0.

3. If you add a number to 0, you still get this number.

Note: 1. Determine the sign of the sum; 2. Determine the absolute value of the sum.

summary

1. Master the addition rules of rational numbers and perform addition operations correctly.

2. To add two rational numbers, first determine the type of addition, then determine the sign of the sum, and finally determine the absolute value of the sum.

3. Pay attention to the addition of two numbers with different signs but different absolute values.

Notice:

Add two numbers with different signs and unequal absolute values. Think step by step:

① Determine the sign of the sum;

② Determine the absolute value of the sum and write the resulting sum;

③ Adding opposite numbers directly yields zero.

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"Addition of Rational Numbers" PPT courseware:

"Addition of Rational Numbers" PPT Courseware Teaching Process Introduction 1. Review Questions 1. Among the following sets of numbers, which number has the larger absolute value? (1) 7 and 4; (2) -7 and 4; (3) 7 and -4; (4) -7 and -4. 2. Explain the actual meaning of the following quantities represented by negative numbers (..

"Addition and Subtraction of Rational Numbers" PPT courseware 2:

"Addition and Subtraction of Rational Numbers" PPT Courseware 2 Knowledge and Skills 1. Be proficient in the addition and subtraction operation rules of rational numbers. 2. Be able to perform mixed operations of addition and subtraction of rational numbers to cultivate students' calculation ability. Process and method - through the calculation of rational numbers Mixed operations of addition and subtraction...

"Addition and Subtraction of Rational Numbers" PPT courseware:

"Addition and Subtraction of Rational Numbers" PPT courseware Learning objectives: 1. Experience the process of exploring the addition of rational numbers, realize the significance of addition of rational numbers, and understand the rules of addition of rational numbers. 2. Be able to skillfully apply rules to perform addition operations of rational numbers. 3. By utilizing data...

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Update Time: 2024-09-27

This template belongs to Mathematics courseware Beijing Normal University seventh grade first volume mathematics industry PPT template

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