"Adding Rational Numbers" Rational Numbers PPT Courseware 3

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"Adding Rational Numbers" Rational Numbers PPT Courseware 3

1. Review questions

1. Compare the magnitude relationships of the following pairs of rational numbers.

(1)7 and 4; (2)-7 and 4; (3)-3.5 and -4; (4)-1/2 and -2/3.

2. Dynamic demonstration, classification and induction, summary rules

Question: Xiao Ming moves on the road in the east-west direction. We define eastward as positive and westward as negative.

Rational number addition rule

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

2. When the absolute values ​​of two numbers with different signs are equal, the sum is 0; if the absolute values ​​are not equal, take the sign of the number with the larger absolute value and subtract the smaller absolute value from the larger absolute value.

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

Expansion and migration

1. If |a|=3|b|=2, and a and b have different signs, then a+b= ( )

A, 5 B, 1 C, 1 or -1 D, 5 or -5

2. If |a|+|b|=0, then a=( ), b=( )

3. If a>0, b<0, |a|<|b|, then a+b ( ) 0

Learn and think

1. Think about it: In the addition operation of rational numbers, what is the relationship between sum and addend?

2. If |a -2|+|b+3|=0, then a=( ), b=( )

Lesson Summary

In this lesson, we mainly learned the operation rules of rational number addition, and became proficient in using operations to perform calculations.

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For more information about the "Rational Numbers Addition of Rational Numbers" PPT courseware, please click the Rational Numbers ppt Rational Numbers Addition ppt tag.

"Adding Rational Numbers" Rational Numbers PPT Courseware 4:

"Adding Rational Numbers" Rational Numbers PPT Courseware 4 1. Analysis of teaching materials 1. Status and role: Basics 2. Teaching objectives: Understand the meaning, master the rules, operate accurately; and cultivate students' ability to observe, analyze and generalize. 3. Key points and difficulties: The key point is the addition method of rational numbers..

"Adding Rational Numbers" Rational Numbers PPT Courseware 2:

"Adding Rational Numbers" Rational Numbers PPT Courseware 2 Examples The standard weight of each bag of wheat is 90 kilograms. The weighing record of 10 bags of haberdashery is as shown in the figure. Compared with the standard weight, how many kilograms does the total of 10 bags of wheat exceed or lack? What is the total weight of 10 bags of wheat? ..

"Adding Rational Numbers" Rational Numbers PPT courseware:

"Adding Rational Numbers" Rational Number PPT Courseware Exploring the Rules of Addition of Rational Numbers 1. A car drives left and right. We stipulate that going left is negative and going right is positive. Then driving 5km to the right is recorded as +5km, and driving 5km to the left is recorded as +5km. +5km. If this car goes first to...

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Update Time: 2024-10-19

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 1 industry PPT template

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