"Simple Application" Percent PPT Courseware

Description

"Simple Application" Percent PPT Courseware

teaching objectives

1. In specific situations, experience the process of discovering problems, raising and answering simple practical questions.

2. Be able to ask mathematical questions related to percentages in real-life situations, and be able to answer simple practical questions about percentages.

3. Feel the role of using percentages to describe practical problems, and enhance your awareness of caring for the community and protecting the environment.

A real estate company is building an "Ankang Community". The urban planning requires that the area of ​​green space must reach at least 30% of the community area. How many square meters of green space should the community have at least?

Tell me what mathematical information you discovered from the picture?

9500×30%=9500×30/100=2850 (square meters)

Answer: The green space area of ​​this community must reach at least 2850 square meters.

"Sunshine Community" covers an area of ​​22,000 square meters, including 5,500 square meters of green space.

Tell me what mathematical information you discovered from the picture?

What fraction of the community area does the green space occupy?

In conclusion

Characteristics of the problem of finding what percent of a number is: The quantity of unit "1" is known, and finding what percent of unit "1" is.

Solution: A number (amount in unit "1") × percentage = partial amount (percentage of a number).

practice

1. my country’s land area is approximately 9.6 million square kilometers. my country’s plateau areas account for approximately 26.04% of the total land area, and plain areas account for approximately 11.98% of the total land area.

(1) How many square kilometers is the area of ​​my country’s plateau area?

(2) How many square kilometers is the area of ​​plain areas in my country?

2. Xinjiang Uygur Autonomous Region is the province with the largest land area in my country, accounting for approximately 17.3% of the country’s land area; the Tibet Autonomous Region’s land area accounts for approximately 12.8% of the country’s land area, ranking second in the country.

(1) What is the approximate land area of ​​the Xinjiang Uygur Autonomous Region?

(2) What is the approximate land area of ​​the Tibet Autonomous Region?

3. The land area of ​​Shijiazhuang is 12,115.9 hectares. By the end of 2010, the green coverage rate of Shijiazhuang’s urban built-up communities was 42.5%. How many hectares of green area is there? (Keep the result to two decimal places)

12115.9×42.5%≈5149.26 (hectare)

Answer: The green area is 5149.26 hectares.

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Update Time: 2024-10-07

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