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"Adding Rational Numbers" Rational Numbers PPT Courseware
Explore the rules for adding rational numbers
1. A car travels 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.
If the car first travels 5km to the right and then 3km to the right, what is the total result after the two movements?
After two trips, the car traveled 8km to the right from the starting point. The formula is: (+5) + (+3) = +8
2. If the car first travels 5km to the left and then 3km to the left, what is the total result after the two movements?
After two trips, the car traveled 8km to the left from the starting point. The formula written is (-5) + (-3) = -8
Rules for addition of rational numbers:
(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. Add two numbers that are opposites of each other. Got 0.
(3) If you add a number to 0, you still get this number.
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"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 3:
"Adding Rational Numbers" Rational Numbers PPT Courseware 3 1. Review Questions 1. Compare the size 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 summary rule issues: Xiao Ming in the East ..
"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? ..