Changing Units

To change units, try drawing a diagram. Suppose you want to change  
\[50cm^2\]
  into  
\[m^2\]
, which the usual unit. May people would divide by 100 because there are 100 centimetres in a metre.
THIS IS WRONG! Draw a recjangle with sides labelled in cm that multiply to give 50.

Change each side into metres, then multiply to give the area in  
\[m^2\]

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