"The meaning and writing method of percentages" PPT courseware for understanding percentages

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"The meaning and writing method of percentages" PPT courseware for understanding percentages

Numbers like this, such as 18%, 50%, 64.2%... are called percentages.

Can you tell me what these percentages above mean?

Observe the following data:

1. In the third unit exam, the passing rate for the six-year (1) class is 96%; the passing rate for the six-year (5) class is 98.5%.

2. The attendance rate of students in Class 6 (1) today is 100%.

3. The oil yield rate of peanut kernels is 38%.

4. In September, the electricity consumption of the primary school affiliated to Zhongda University was 20% lower than that in October.

5. my country’s cultivated land area accounts for about 7% of the world’s.

6. my country’s population accounts for about 20% of the world’s population.

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

A number that expresses what percent of another number is a number is called a percentage.

Percent is a special ratio, and its consequent is a fixed number 100, so it is also called percentage or percentage.

In production and life, people often use percentages because they are easy to compare and easily reflect the situation.

Discussion: What numbers can the numerator of percentage be?

Since a percentage expresses the ratio of two numbers, the numerator can be an integer or a decimal, a multiple less than 100, or a number equal to or greater than 100.

What is the difference in meaning between percentages and fractions?

A percentage is a number that expresses the percentage of one number to another. It only expresses the quantitative relationship between two numbers. It is a fraction and cannot express quantity, so it cannot have a unit name; a fraction expresses the unit "1". "Divided evenly into several parts, it represents one or several parts of a number. It can not only express the relationship between two numbers, but also express a specific number. When expressing a specific number, the unit can be written after it.

What is the connection between percentages and fractions?

1. The denominator of a percentage is 100, and the denominator of a fraction can be any natural number that is not 0.

2. Fractions can represent either multiples of two numbers or an actual quantity; percentages can only represent multiples of two numbers, so percentages cannot have unit names.

3． When a calculation result is expressed as a fraction, it is usually written as the simplest fraction; when a calculation result is expressed as a percentage, even those that can be reduced cannot be reduced.

4. Fractions and percentages are also written in different forms.

Difficult to tell true from false

1. Xiaohong’s height is 147% meters. ( )

2. 34% is read as one hundred and thirty-four. ( )

3. A bag of biscuits weighs 50% kilograms. ( )

4. The number of girls is 45% of the class. ( )

5. A batch of rice eats 0.37 tons, which can also be written as 37% tons. ()

6. The numerator of percentage can be a decimal. ()

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Update Time: 2024-11-12

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