Sphero's + Mathematics (Area)

– Sphero as a robo vac. How effective are they?
Calculate the area a sphero can cover (as the sphero is acting as the robo vac) by using grid paper inside a plastic tub, the sphero can roll in paint and then roll around the floor (over the grid paper which is the shape of a loungeroom) and students can calculate surface area that the sphero covers in a set amount of time.

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