"Application of Positive and Negative Numbers (2)" PPT

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"Application of Positive and Negative Numbers (2)" PPT

Part One: Review old knowledge and explore new knowledge

choose.

If progress, income and profit are stipulated as positive, then which of the following statements is wrong ( ).

A. -18 meters means retreating 18 meters

B. -80 yuan means profit of 80 yuan

C. -40,000 yuan means spending 40,000 yuan

New knowledge exploration

A certain class used extracurricular activity time to hold the "Dr. Rabbit" mathematics competition.

10 points are awarded for answering a question correctly, 10 points are deducted for answering a question incorrectly, and 0 points are awarded for no answer.

There is a batch of bagged white sugar with a standard weight of 455 grams per bag. The quality inspector selected 7 bags for testing, and the results are as follows:

Use positive numbers to represent the number of grams exceeding the standard mass, use negative numbers to represent the number of grams less than the standard mass, and use 0 to represent those that meet the standard mass.

What does "±5g" on the packaging bag mean?

The net weight of 500g means that the bag of salt is removed from the packaging bag, and the mass of the salt is 500g.

±5g means that the mass of salt in this bag of salt is at most (500+5) g, that is, 505g; the mass of salt in this bag of salt is at least (500-5) g, that is, 495g. In the range of 495 to 505g, this kind of bagged salt is qualified.

Part Two: Consolidation Practice

1. The weights of the first group of 6 students in Class 6 (1) are as follows:

(1) What is the average weight of these 6 students in kilograms?

(42+36+37+40+38+35)÷6=38 (kg)

Answer: The average weight of these 6 students is 38 kilograms.

(2) Use positive, negative or 0 to express the result of each person's weight compared with the average weight.

Keywords: Free download of Hebei Education Edition mathematics PPT courseware for sixth grade volume 2, application of positive and negative numbers PPT download, .PPT format;

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"Application of Positive and Negative Numbers (1)" PPT:

"Application of Positive and Negative Numbers (1)" PPT Part One: Review of Old Knowledge 1. Readings, which numbers are positive and which are negative. -8 -28 0 +81 +65 2. One evening, the temperature in Huangshan Mountain dropped by 7 degrees Celsius from above zero in the morning..

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Update Time: 2024-11-22

This template belongs to Mathematics courseware Hebei Education Edition Sixth Grade Mathematics Volume 2 industry PPT template

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