"Rational Numbers" Rational numbers and their operations PPT courseware 2

Description

"Rational Numbers" Rational numbers and their operations PPT courseware 2

(1). In a knowledge contest, if +10 points means adding 10 points, how do you express deducting 20 points?

Solution: (1) Deduct 20 points and record it as -20 points

(2) When someone turns the turntable, if +5 turns means 5 turns in the counterclockwise direction, how does it mean 12 turns in the clockwise direction?

Turning 12 times clockwise is recorded as -12 times

(3) In a certain table tennis quality inspection, a table tennis ball exceeding the standard mass by 0.02 grams is recorded as +0.02 grams. So what does -0.03 grams mean?

-0.03g means that the mass of the table tennis ball is lower than the standard mass of 0.03g.

Intellectual arena

1. Are there any rational numbers that are neither positive nor negative?

2. One evening, the temperature in Huangshan Mountain dropped by 7 degrees from 2 degrees above zero at noon. What was the temperature in Huangshan Mountain that evening?

3. The temperature in Huangshan Mountain dropped from 2 degrees above zero at noon to minus 7 degrees in the evening. How many degrees did the temperature drop?

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Update Time: 2024-11-22

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

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