How many species are threatened with extinction?

Grade level: 4th – 5th grades

Skills: Rounding (whole numbers)

Related environmental issues: Biodiversity

The number of species that are at risk of becoming scarce has been increasing. They are threatened with extinction mainly because they lost their homes. Humans are responsible for the habitat loss when we destroy their habitats by developing housing, industry, and agriculture. The table below shows number of threatened species.

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  1. Round the number of threatened insects to the nearest thousands.
  2. Round the number of threatened fishes to the nearest hundreds.
  3. Round the number of threatened plants to the nearest thousands.
  4. Round the number of threatened mammals to the nearest tens.
  5. Round the number of total threatened species to the nearest ten thousands.

 

Source: IUCN Red List of Threatened Species, 2020, Summary statistics (Table 1a)


Answer keys

1.2,000
2.2,700
3.16,000
4.1,240
5.30,000

 

 


 

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How many more wild giant pandas do we have now?

Grade level: 6th – 8th grades

Skills: Percentage

Related environmental issues: Biodiversity & Deforestation

[The use of a calculator is permitted]

Giant panda has long been on the endangered species list because the forests they live in China have been destroyed as the population in the country grows. However, due to conservation efforts made by the Chinese government, wild panda numbers have been increasing. The pandas are still at risk but they are now off the endangered species list.

According a survey, there are 1,864 giant pandas in the wild, and the population has grown by 16.8% over the last decade.  The survey also found that 66.8% of wild giant pandas live within protected panda nature reserves in China, while the rest live outside of the protected areas.

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  1. How many wild giant pandas were there 10 years ago? How many more giant pandas do we have now? Round to the nearest ones.
  2. How many giant pandas live outside of the protected panda nature reserves? Round to the nearest ones.

 

Source: WWF, 2015. Panda population grows nearly 17 percent

Photo: WWF

 


Answer keys

  1. There were 1,596  pandas ten years ago. The population increased by 268 [116.8/1864 = 100/X]
  2. 619       [1,864 x (1 – 0.668)]