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Activity
The Math of Bicycles: Wheel Figure This Out (Grades 4 7) Activity
PBS

The Math of Bicycles: Wheel Figure This Out (Grades 4 7)

For Teachers 6th - 8th
Several good activities here. Look particularly at Wheel Figure It Out (which is the opening page) and Gearing Up. There are answers to the very good questions at the bottom of each.
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