How to convert metric units using factors like 41 cm x, Ask an Expert

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How to convert metric units using factors , like 4.1 cm x 1m/10 ^2=4.1x10^-2 or 0.041 cm,this is an example from a worksheet,i understand how you have to put what you want on top and what you have on the bottom but i dont understand how to do the work and set it up for other units for example converting megagrams to nano grams.

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