Once upon a time there were 20 brothers and sisters. Their mother was a physicist, their father was a chemist, and their family name was Measure so naturally they were named after the International System of Units (commonly called the metric system). SI uses 20 prefixes for describing how big or small something is no matter what you are measuring. For example, 1000 meters is called a kilometer and 1000 grams is called a kilogram.

Search through this web site to help big sister Zetta find eight of her smaller brothers and sisters. Then fill in their names in the chart below. (The first one is filled in for you.) How many can you find? These kids are a pretty brainy bunch. Check out what they have to say. See the puzzle solution for answers.

 Multiples and Submultiples Prefix Symbol 1 000 000 000 000 000 000 000 000 = yotta Y 1 000 000 000 000 000 000 000 = zetta Z 1 000 000 000 000 000 000 = exa E 1 000 000 000 000 000 = ________ P 1 000 000 000 000 = ________ T 1 000 000 000 = giga G 1 000 000 = ________ M 1 000 = kilo k 100 = ________ h 10 = deka da 1 0.1 = ________ d 0.01 = centi c 0.001 = milli m 0.000 001 = micro µ 0.000 000 001 = ________ n 0.000 000 000 001 = ________ p 0.000 000 000 000 001 = femto f 0.000 000 000 000 000 001 = atto a 0.000 000 000 000 000 000 001 = zepto z 0.000 000 000 000 000 000 000 001 = ________ y

Created: May 8, 2001
Last updated: August 15, 2001
Contact: inquiries@nist.gov

 Just wait until I get my hands on those little munchkins ! -- Zetta