"Simple Application" Percent PPT Courseware 2

Description

"Simple Application" Percent PPT Courseware 2

teaching objectives

1. Experience the process of understanding forest coverage data and information in my country and the world, discovering problems, raising and solving them.

2. Be able to comprehensively apply the knowledge learned to solve practical problems related to forest coverage.

3. Understand the gap between my country’s forest coverage rate and the world’s average forest coverage rate, and cultivate awareness of caring about national affairs and protecting the green environment.

(1) How many square kilometers has my country’s forest area increased in 10 years?

Observing the pictures, what information did you discover?

9.6 million square kilometers = 9.6 million square kilometers

9600000×16.55%=1588800 (square kilometers)

9600000×20.36%=1954560 (square kilometers)

1954560-1588800=365760 (square kilometers)

Answer: my country's forest area has increased by 365,760 square kilometers in 10 years.

(2) How many square kilometers are added each year on average?

365760÷10＝36576 (square kilometers)

Answer: The average annual increase is 36,576 square kilometers.

(3) Based on the above estimates, how many years will it take to achieve the goal of my country’s forest coverage rate reaching 30%?

9600000×30%=2880000 (square kilometers)

2880000×1954560=925440 (square kilometers)

925440÷36576≈26 (years)

Answer: It will take about 26 years.

In conclusion

Forest coverage = forest area/land area × 100%

Given the forest coverage rate and land area (a quantity represented by the unit "1"), calculate the forest area by multiplication, and forest area = land area × forest coverage rate.

practice

1. The following are statistical tables of forest resources in several countries.

(1) The order of forest areas owned by the three countries from largest to smallest is ______, ______, ______.

(2) The order of forest coverage in the three countries from high to low is ______, ______, ______.

(3) Based on the data in the table above, calculate the approximate land areas of the three countries. (Results are retained as integers)

2. my country’s “Three North Shelterbelt Project” plans to afforestation 3,560 hectares by 2050. As of 2003, 66% of the afforestation plan has been completed. How many thousands of hectares have been reforested?

3560×66%=2349.6 (10,000 hectares)

Answer: 23.496 million hectares of forest have been planted.

3. In 2011, my country's "National Key Forestry Projects" completed afforestation area of ​​3.0939 million hectares, of which the forest restoration project accounted for 12.18% of the total afforestation area. What was the total afforestation area completed by converting farmland into forests in 2011?

309.39×12.18%=37.68 (10,000 hectares)

Answer: In 2011, a total of 376,800 hectares of farmland were converted into forests.

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Update Time: 2024-09-05

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