## 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

\[m^2\]