Measurement & Data

A handy trick for remembering the basic metric prefixes is the mnemonic "King Henry Died Until Drinking Chocolate Milk," (or, if you prefer, "King Henry Doesn't Usually Drink Chocolate Milk"). The first letter of each word corresponds to a basic metric prefix, in order of largest to smallest, except for the "U" in "Until", which corresponds to "unit," or the metric base units (meter, liter, etc.)

http://www.felloweducators.com/brick/sci/scir_king_henry.htm

http://www.mathplayground.com/howto_Metric.html

http://www.wikihow.com/Convert-Within-Metric-Measurements