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"Rational Numbers" PPT Courseware 2
We often hear weather forecasts:
Today's highest temperature
Beijing -10℃, Haikou 20℃,
Hangzhou 10℃, Qingdao 0℃
If a number lower than 0 appears above, we can use a number with a "-" sign (pronounced: negative) to represent it. For example, -10.
For numbers higher than 0, you can use numbers with a "+" sign (pronounced as: positive) to represent them. For example, +10, +20.
Example 1(1) In a knowledge contest, if +10 points means adding 10 points, how do you express deducting 20 points?
(2) Someone rotates the turntable. If +5 is used to represent 5 turns in the counterclockwise direction, how does it mean that it is turned 12 times in the clockwise direction?
(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. So what does -0.03 grams mean?
Solution: (1) 20 points will be deducted and recorded as -20 points;
(2) Turn 12 times in the clockwise direction and record it as -12 times;
(3)-0.03g means that the mass of the table tennis ball is 0.03g lower than the standard mass.
fill in the blank:
1. Profit is stipulated to be positive. A company lost 25,000 yuan last year and recorded it as ________ million yuan. This year it made a profit of 32,000 yuan, which was recorded as ________ million yuan;
2. It is stipulated that the altitude above sea level is positive. Urumqi, Xinjiang is 918 meters above sea level, which is recorded as altitude___________;
3. The lowest point of Urumqi is 155 meters below sea level, which is recorded as altitude __________.
Positive integers, zero, and negative integers are collectively called integers;
Positive fractions and negative fractions are collectively called fractions
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