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 big is the wilderness land protected by President Trump?

Grade level: 4th – 6th grades

Skills: Division (large numbers)

sRelated environmental issues: Biodiversity

President Trump passed the wilderness preservation law on March 11, 2019. With the legislation, 1.3 million acres of federal land in California, Oregon, Utah, and New Mexico will be protected from logging, oil drilling, mining, and road-building.

  1. Death Valley, California

    Death Valley, California  (Photo credit: ROBYN BECK)

  1. Former President Obama passed the law to protect 2 million acres of wilderness across the West in March 2009. With the both laws, how many acres of land is protected from logging, oil drilling, mining, and road-building?
  2. The size of Rhode Island is 750,000 acres. How many times is the area protected by the two presidents larger than the state of Rhode Island?

Sources: East Bay Times, March 15, 2019. 

Note) The actual size of Rhode Island is 775,680 acres.

 

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Answer keys

  1. 3.3 million acres (1.3 + 2 = 3.3)
  2. 4.4 times (3,300,000 / 750,000 = 4.4)