*Grade level: 5th – 6th grades*

*Skills: Addition & subtraction (decimal numbers)*

*Related environmental issues: Energy*

The circle below shows how much new solar power was installed the United States each year between 2005 and 2015.

- Has the number increased or decreased as time goes by?
- What is the difference between the numbers of the years 2008 and 2009?
- Is the amount of solar panels installed in 2011 more than those installed in 2009 and 2010 combined?
- What is the difference between the largest number and the smallest number?
- Which two numbers make the largest value when added

Sources: REN 21, 2016

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Answer keys

- increased
- 0.382 – 0.298 = 0.084
- 1.922 > (0.382 + 0.852)
- 7.26 – 0.079 = 7.181
- 6.201 and 7.26