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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What state generates the third largest amount of electricity from wind in the United States?

Grade level: 4th – 6th grades

Skills: Number comparison / Subtraction (4-digit numbers)

Related environmental issues: Energy

The map below shows the top 5 states that generate the largest amount of electricity from wind.

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  1.  What state generates the largest amount of electricity from wind in the United States?
  2. What state generates the third largest amount of electricity from wind in the United States?
  3. How much more electricity does Iowa generate from wind than California?
  4. How much more electricity does Oklahoma generate from wind than Kansas?

 

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Answer keys

  1. Texas
  2. Oklahoma
  3. 2,537 MW (8,422 – 5,885 = 2,537)
  4. 2,409MW (8,072 – 5,663 = 2,409)