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Lynn, If they don't understand the basic fraction values the way you have them, have you tried 100cm/1m = 1 all the ones - and then use multiplication of fractions? If you need a visual aid, I have something that was given to me called the "gallon guy" with the units of equality coming from the gallon body. It is one piece and then the arms have 4 pieces, since 4 quarts = a gallon, with of course 2 pints sitting on each arm of the quart. Maybe you can create a centipede to reinforce the vocabulary, where centi means 100, and go from there. Maybe your students could design their own. Just a thought... hope it works!
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