If the dimensions of an object double, its volume increases by a factor of eight.
The blue point is exactly in the middle of two red points. What are their coordinates?
Estimate the size of an alien given the size of their hand. This could be an introduction to scale factors.
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Solve the problem of getting four people through a tunnel with one torch in the minimum amount of time. The solution is not obvious but when you get it you see the elegance and beauty of its cunning.
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