Grade level: 4 – 5th grades
Skills: Multiplication & Division
Related environmental issues: Reduce, reuse & recycle
Area level: National
Recycling paper prevents many trees from being cut down for paper. It is reported that we can save one tree by recycling a stack of newspaper 3 feet high.

Sean recycled a stack of newspaper 21 feet high. How many trees can Jack save by recycling the newspeper?
 To save 13 trees, a stack of how many feet of newspaper do you need to recycle?
 Maya wants to save 18 trees. She gathered newspaper to recycle and made a stack of newspaper 56 feet high. Did she gather enough newspaper? Explain.
Source: Recycle Across America
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Answer keys
 7 trees (21/3=7)
 39 feet (13×3=39)
 Yes. She need a stack of newspaper 54 feet high (18×3=54) to save 18 trees. She gathered a stack of newspaper 56 feet high so she has enough newspaper.