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)]

How many non-native marine species were found in Galápagos islands?

Grade level: 6th grades

Skills: Percentage and addition

sRelated environmental issues: Biodiversity

The Galápagos islands, which lie in the equatorial Pacific, have long been recognized for their remarkable biodiversity and their large number of endemic species.  However,  the environment of the Galápagos islands started to change because many non-native species have been brought to the islands by human activity over the last 500 years.

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A recent research identified 53 non-native marine species in the islands.

  1. The research showed that 93% of the 53 species were likely brought to the Galápagos Islands by ships. How many non-native marine species were brought by ships? Round to the nearest whole number.
  1. The Galápagos islands were first visited by Europeans in the 1500s. By the late 1960s, 2000–3000 people lived on the Islands. In a 2010, there were 25,000 residents and one-quarter million visitors annually. Together, how many residents and tourists a year are there in the Galápagos islands?

 

Answer keys

  1. 49 species (53 x 0.93 = 49.29)
  2. 275,000 (25,000 + 250,000= 275,000)