How many countries agreed to stop using coal?

Grade level: 4th – 5th grades

Skills: Fraction & Percentage

Related environmental issues: Energy & Climate Change

The annual climate conference* took place in Bonn, Germany, during November 6 and 17 to talk about how to stop ongoing climate change. Using coal for electricity generation is considered one of the main causes of climate change.

power-plant-524

Photo) Coal-fired plants burn coal to generate electricity

During the conference, 15 countries**  joined an anti-coal team and announced that they would stop using coal.   Those countries try to increase the number of team countries to 50 countries by the next 2018 conference.

  1. Which fraction shows the ratio of the current team countries and the targeted team countries.

A. 3/5

B. 1/2

C. 3/10

D. 5/15

2. Turn the fraction into percentage.

Sources: Independent (November 16, 2017), COP23: At least 15 countries join anti-coal alliance in defiant message to Trump

Photo: Ecology Global Network

* COP 23

**Current anti-coal team members include Canada, the UK, Denmark, Finland, Italy, France, the Netherlands, Portugal, Belgium, Switzerland, New Zealand, Ethiopia, and Mexico

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Answer keys

1. C  (15/50 = 3/10)

2. 30%

 

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.

Screen Shot 2017-10-02 at 12.21.18 PM

  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