Mathematical percentage handwritten newspaper

nature

A number indicating that one number is a percentage of another number is called a percentage. Percentages are also called percentages or percentages. Percentages are usually expressed as "%". Percentages are special fractions and cannot be expressed by fractions.

A number indicating that one number is a percentage of another. Percentages are also called percentages or percentages. Percentages are usually represented by the symbol "%"(called percent sign) instead of fractions. For example, 4 1% is written as 4 1%. Since the denominator of the percentage is 100, it is all in 1%.

A number that represents the fraction of one number to another is called a percentage. Percentages are also called percentages or percentages. Percentages are usually not written in the form of fractions, but expressed by adding a percent sign "%"after the numerator. There are many percentages in life:

The weather forecast program on TV will broadcast the weather situation and precipitation probability of that night and tomorrow day every day, prompting everyone to prepare in advance, just like the precipitation probability of tonight is 20%, and there will be a strong wind of 5 ~ 6 in the daytime tomorrow, and the precipitation probability is 10%, so you should add clothes sooner or later. 20% and 10% are clear and concise.

With the rapid development of science and technology, every middle-aged person is now equipped with various styles of mobile phones. Glenn Wilson, a psychologist at Royal College, University of London, proved that reading short messages with his head down all the time will lead to low work efficiency and slow down the brain reaction ability of staff, and the IQ of people who read short messages often will drop by 10%, which once again proved in percentage form that although mobile phones provide convenience for people, they are very harmful to human health.

App application

Although the denominator of the percentage is 100, the numerator can be greater than 100, for example, 200% means twice the original number. For example, a company's net profit last year was 6.5438+0.2 million yuan, and this year's net profit was 6.5438+0.2 million yuan, which can be expressed as "this year's net profit increased by 20% compared with last year" or "this year's net profit increased by 654.38+0.20% compared with last year", but this writing method is rarely used.

Percentages are sometimes misleading. Many people think that the percentage increase will be offset by the same percentage decrease, for example, an increase of 50% from 100 equals 100+50, that is, 150. And a 50% reduction from 150 is 150-75, which is equal to 75. The final result is less than the original number 100.

Percentage in life

There are many percentages in daily life, but I saw this percentage on my father's sweater, 80%, and I found this percentage in my mother's trade, 82.8%. It's strange that there are decimals on sweaters. I found 90% on my sweaters, and there are percentages everywhere in my life.

1. There are about 80% nitrogen and 20% oxygen in the air.

2, six (2) class physical exercise compliance rate of 95%.

3. 79% people in America want to stop the war.

4. Holiday consumption in Shanghai accounts for 50% of the whole year, and night consumption accounts for 50% of the whole day.

From June 5438 to last year 10, due to the National Day holiday, the total social retail sales in Shanghai reached 4.887 billion yuan, breaking the monthly sales record in Shanghai. According to statistics, the total retail sales of social consumer goods in Shanghai last year was 654.38+0.59 billion yuan, and holiday consumption accounted for half of the country.

Similarly, due to the accelerated pace of work and life, in the total retail sales of social consumer goods of 654.38+059 billion yuan completed last year, night consumption after 6 pm also accounted for 50% of the total consumption.

5. In China's GDP, the proportion of primary industry decreased from 23.8% in 1992 to 2 1.2% in 1993.

This year's output is 30% higher than last year's.

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