The calculation formula of percentage: quantity ÷ total × 100= percentage, and 30% is 3÷ 1× 100=30%.

Percentages are usually not written in the form of fractions, but expressed by percent signs (%), such as 4 1%, 1% and so on. Because the denominator of the percentage is 100, that is, 1% is the unit, so it is easy to compare. Percent only indicates the relationship between two numbers, so you can't add units after the percent sign. Common percentages and decimals are interchangeable.

Percentage in daily life

1, the weather forecast program on TV will report the weather and precipitation probability that night and tomorrow.

The probability of precipitation tonight is 20%.

2. Macro description of the experimental subjects when releasing the survey results.

For example, an experiment concluded that the IQ of people who often read short messages would drop 10%.