Has the coal production increased or decreased in the largest coal producing states?

Grade level:  3rd – 5th grades

Skills: Subtraction (3-digits)

Related environmental issues: Energy & Climate Change

President Trump visited China this week. China depended mostly on coal for their energy resources, but the use of coal has been declining these days because the coal use causes both health and environmental problems.  Declining of coal production has also been seen in the United States. The table below compares the amount of coal produced between 2014 and 2015 in the top 5 coal-producing states.

 

Table: The amount of coal produced in the top 5 coal-producing states (2014 and 2015)

(Unit: Thousand short tons)

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  1. Among the five states, which state reduced their coal production the most?
  2. Among the five states, which state reduced their coal production the least?
  3. Between 2014 and 2015, altogether how much did coal production decrease in five states?

Sources: U.S. Energy Information Administration, 2017. Annual Coal Production by State

 

Answer keys

  1. Wyoming
  2. Illinois
  3. 20 + 16 + 16 + 2 + 11 = 65 (thousand short tons)

 

Which countries sold more electric cars in 2016, the United States or China?

Grade level:  3rd – 4th grades

Skills: Rounding

Related environmental issues: Energy & Climate Change

The number of electric vehicles (EVs)* on the road has been significantly increasing.   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.

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  1. Round the number of EVs sold in Canada to the nearest hundred.
  2. Round the number of EVs sold in the United Kingdom to the nearest thousand.
  3. Round the number of EVs sold in Japan to the nearest 10 thousand.
  4. Round the number of EVs sold in the United States to the nearest 10 thousand.
  5. Round the number of EVs sold in China to the nearest thousand.

* Electric vehicles are exclusively powered by electricity like iPhones and can reduce the emission.

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

 

Answer keys

  1. 11,600
  2. 38,000
  3. 20,000
  4. 160,000
  5. 336,000