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There is really no alternative to experience: you have to get the feeling of "big" and "small" units. If you were to be given 324 pennies I bet you'd have no difficulty in working out how many pounds that was. Initially you could design a crib sheet, 1000g = 1kg etc. I have a few ideas on handling this problem but the format is too restricted on this platform to explain them. Presumably you have a list of the prefixes you need? pico, nano, milli, kilo, mega etc?
18 March 2012
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