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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Is it OK? – thousands of egg-shaped ice balls covering a beach

Grade level: 3rd-5th grades

Skills: measurement (length/mass)

Related environmental issues: climate change

It was reported that a beach in Finland was covered by thousands of egg-shaped balls of ice in the beginning of November, 2019. Experts said that it is a rare weather phenomenon. They ranged from the size of an egg to the size of a football.

1. The length of an egg is 2 inches. The length is a football is one foot. How many times is an football longer than an egg?

2. The weight of an egg is 2 ounces. The weight of an football is one pound. How many times is an football heavier than an egg?

Source) BBC News, Nov 7, 2019. ‘Ice eggs’ cover Finland beach in rare weather


Answer keys

1. 6 times. (12/2=6)

2. 8 times (16/2=8)