How big is the wilderness land protected by President Trump?

Grade level: 4th – 6th grades

Skills: Division (large numbers)

sRelated environmental issues: Biodiversity

President Trump passed the wilderness preservation law on March 11, 2019. With the legislation, 1.3 million acres of federal land in California, Oregon, Utah, and New Mexico will be protected from logging, oil drilling, mining, and road-building.

  1. Death Valley, California

    Death Valley, California  (Photo credit: ROBYN BECK)

  1. Former President Obama passed the law to protect 2 million acres of wilderness across the West in March 2009. With the both laws, how many acres of land is protected from logging, oil drilling, mining, and road-building?
  2. The size of Rhode Island is 750,000 acres. How many times is the area protected by the two presidents larger than the state of Rhode Island?

Sources: East Bay Times, March 15, 2019. 

Note) The actual size of Rhode Island is 775,680 acres.




Answer keys

  1. 3.3 million acres (1.3 + 2 = 3.3)
  2. 4.4 times (3,300,000 / 750,000 = 4.4)


What country sold the largest number of Electric Vehicles in 2016?

Grade level:  4th – 5th grades

Skills: Number comparison & Subtraction (Large numbers) 

Related environmental issues: Energy & Climate Change

Dyson, the UK company best known for its vacuum cleaners, recently announced its plan to build its own electric vehicles by 2020.  Conventional cars produce a lot of carbon emissions that contribute to climate change and smog.  Electric vehicles can reduce the emission because those cars are exclusively powered by electricity like iPhones. There were about 2 million electric vehicles running in the world in 2016. The table below shows the number of electric vehicles sold in five countries in 2016.

Screen Shot 2017-10-02 at 12.21.18 PM

  1. What country sold the largest number of electric vehicles in 2016?
  2. Among Japan, the United States, and Canada, which country sold the smallest number of electric vehicles in 2016?
  3. What country sold about half of the electric vehicles sold in China?
  4. How many more electric vehicles did the United Kingdom sell than Japan?

Sources: International Energy Agency, 2017. Global EV Outlook 2017 


Answer keys

  1. China
  2. Canada
  3. United States
  4. 37,912 – 24,851 = 13,061