Percentage is a common mathematical concept in our daily life. Whether it is the discount when shopping, the evaluation of test scores, or the calculation of investment income, you need to use percentages.

I. The meaning of percentage

Percentage refers to the proportional representation method based on 100. It can be used to express the relationship between two numbers, for example, one number is a fraction of another. The calculation formula of percentage is:

Percentage = (required part/total part) × 100%

Second, the steps to calculate the percentage

Determine the required part and the whole part: first, make clear which part is needed and the proportion of the required part to the whole part.

Division: divide the required part by the whole part to get a decimal.

Convert to percentage: multiply the decimal by 100 to get the percentage.

Simplified percentage: according to needs, you can simplify the percentage, that is, divide it by 100 to get an integer.

Three. Example of calculating percentage

For example, there are 50 students in a class, 30 of whom are boys. It is required to calculate the percentage of boys in the class.

Determine the required part and the overall part: the required part is the number of boys, and the overall part is the total number of classes.

Division operation: 30/50=0.6

Converted into percentage: 0.6× 100=60%

Simplified percentage: 60% can be simplified to 60/ 100=0.6.

So the proportion of boys in the class is 60%.

Fourth, the skill of calculating percentage.

Use fractional conversion: If you know that one number is a fraction of another number, you can first convert the fraction to decimal and then calculate the percentage.

Using proportional relation: If the ratio of two numbers is known, the percentage can be directly calculated by using proportional relation.

Simplify calculation: when calculating the percentage, you can divide the value first and then calculate it to reduce the error.

Verb (abbreviation of verb) matters needing attention

When calculating the percentage, it is necessary to ensure the consistency between the required part and the whole part to avoid calculation errors.

When calculating percentages, there may be errors in the results. At this point, you can use rounding method to take an integer or one decimal place.