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I have found very few students who can do proportional reasoning when
they arrive, and they are very resistive to using it to solve
problems. For example studying Kepler's Laws, having them work
examples using ratio & proportion in class, I ask them on a test to
find the period of an asteroid orbiting the Sun at a distance of 3.5
AU. They ask me what the mass of the Sun is. I tell them they don't
need it. They stare at me like a calf looking at a new gate