Calculating the Wheel Rotations... 

Moon Distance Measure DrGraeme.net  

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Using centimetres, measure the diameter of the wheel, decide how far you want your robot to go, and then calculate the number of wheel rotations needed for your Robot to travel this distance. Videos (1:12).

This calculation can also be done using inches, see the videos below (1:01).

Small,  Big. Small,  Big.

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