The metric prefix that represents 1 x 10^6 is "mega-." In scientific notation, "mega-" is denoted by the symbol "M." Therefore, 1 x 10^6 meters would be equivalent to 1 megameter (1 Mm). This prefix is commonly used in various fields such as physics, engineering, and technology to denote large quantities or measurements.
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centi -
Giga- It is worth noting that when used in computer terminology, this prefix is something of an anachronism. The computer prefix "Giga" refers to 2^30, which is 1,073,741,824 and not 1,000,000,000 as Giga means in the metric system.
The prefix "mega" means 106. So 1 megapascal = 1,000,000 pacals or 1 pascal = 0.000001 megapascals.
The deci- prefix means one tenth (1/10 = 0.1) The centi- prefix means one hundredth (1/100 = 0.01) Therefore for the same unit, a deci- one is larger than a centi- one. eg 1 decimetre is larger than 1 centimetre since 1 dm = 0.1m > 0.01m = 1 cm.
When dealing with metric units, the prefix "kilo-" means "1,000".1 kilogram = 1,000 grams