How much recycled newspaper will save a tree?

Grade level: 4th – 5th grades

Skills: Fraction (multiplication/division)

Related environmental issues: Reduce/Reuse/Recycle

 

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Recycling paper prevents many trees from being cut down for paper. It is estimated that we can save one tree by recycling a stack of newspaper 3 feet high.

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  1. Sean recycled a stack of newspaper 23 feet high.  How many trees did Sean save by recycling the newspaper? Answers must be fractions in mixed numbers.
  2. To save 13 1/6  trees, a stack of how many feet of newspaper Does Sean need to recycle?  Convertfractions into mixed numbers.
  3. Maya wants to save 18 2/3trees. She gathered newspaper to recycle and made a stack of newspaper 55 feet high.  Did she gather enough newspaper? Explain.

 

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Source: Recycle Across America, Recycling facts


Answer keys

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How many homes has Former President Jimmy Carter helped powering with clean energy?

Grade level: 4th – 6th grades

Skills: Multiplication (decimals)

Related environmental issues: Renewable Energy

Former President Jimmy Carter is a big supporter of renewable energy and helped a solar farm project which constructed as many as 3,850 of solar panels in his hometown in Georgia. He also installed 320 solar panels on the Jimmy Carter Presidential Library.

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Plains Solar Farm, Georgia (Photo: Futurism)

  1. Each solar panel can power 1.3 American homes. How many homes can the solar farm power?
  2. How many homes can the solar panels on the Library power?
  3. How many homes has Former President Jimmy Carter helped powering with clean energy?

 

 

Note 1) The Plains solar farm generates 55 million kilowatt hours per year.

Note 2) The average annual electricity consumption for a U.S. residential utility customer was 10,766 kilowatthours (kWh). (U.S. Energy Information Administration)

 

Note 3) The numbers were slightly modified. The actual numbers of solar panels are 3,852 and 324.

 

 

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Answer keys

  1. 5,005 homes    (3,850 x 1.3 = 5,005)
  2. 416 (320 x 1.3 = 416)
  3. 5,421 homes (5,005 + 416 = 5,421)