Simple conversion from yards to inches....http://www.khanacademy.org/math/algebra/ratios-proportions/v/unit-conversion-with-fractions
A long one (9+ minutes) with lots of info on conversions....http://www.khanacademy.org/math/arithmetic/basic-ratios-proportions/v/unit-conversion
Converting Units of Lengthhttp://www.khanacademy.org/math/arithmetic/basic-ratios-proportions/v/converting-units-of-length
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