What state generates the largest solar power in the United States?

Grade level: 5th – 6th grades

Skills: Circle graph & Fraction 

Related environmental issues: Renewable Energy

The circle graph below shows how much solar power was generated from the top five solar power generating states in the United States in December, 2017.

Screen Shot 2018-03-15 at 1.03.58 PM

  1. What state generated larger amount of solar power than the rest of the states combined?
  2. What state generated as much solar power as North Carolina?
  3. What state generated one seventh as much solar power as California?
  4.  What state generated one fourth as much solar power as North Carolina and Arizona combined?

Sources: U.S. Energy Information Administration, 2018. Electric Power Monthly (Table 1.17.A. Net Generation from Solar Photovoltaic)



Answer keys

1. California

2. Arizona

3. Nevada    42 ÷ 7 = 6

4. Texas    8 + 8 = 16    16 ÷ 4 = 4



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.


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


Answer keys

1. C  (15/50 = 3/10)

2. 30%