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Traditional American usage (which was also adapted from French usage but at a later date), Canadian, and modern British usage assign new names for each power of one thousand (the short scale). Thus, a billion is 1000 × 1000 2 = 10 9; a trillion is 1000 × 1000 3 = 10 12; and so forth.
100 000 000 000; short scale: one hundred billion; long scale: hundred thousand million, or hundred milliard) Astronomy: There are 100 billion planets located in the Milky Way. [30] [31] Biology – Neurons in the brain: approximately (1±0.2) × 10 11 neurons in the human brain. [32]
The Ancient Greeks used a system based on the myriad, that is, ten thousand, and their largest named number was a myriad myriad, or one hundred million. In The Sand Reckoner, Archimedes (c. 287–212 BC) devised a system of naming large numbers reaching up to ,
For example "billion" may be easier to comprehend for some readers than "1,000,000,000". But, as names, a numeric value can be lengthy. For example, "2,345,789" is "two million, three hundred forty five thousand, seven hundred and eighty nine".
Billion is a word for a large number, and it has two distinct definitions: 1,000,000,000, i.e. one thousand million, or 10 9 (ten to the ninth power), as defined on the short scale. This is now the most common sense of the word in all varieties of English; it has long been established in American English and has since become common in Britain ...
Visualization of 1 trillion (short scale) A Rubik's cube, which has about 43 trillion (long scale) possible positions. Trillion is a number with two distinct definitions: 1,000,000,000,000, i.e. one million million, or 10 12 (ten to the twelfth power), as defined on the short scale. This is now the meaning in both American and British English.
10 −1: −1 one 1 10 0: 0 ten deca-(da) 10 10 1: 1 hundred hecto- (h) 100 10 2: 2 thousand kilo- (k) 1000: 10 3: 3 million mega- (M) 1 000 000: 10 6: 6 billion giga- (G) 1 000 000 000: 10 9: 9 trillion tera- (T) 1 000 000 000 000: 10 12: 12 quadrillion peta- (P) 1 000 000 000 000 000: 10 15: 15 quintillion exa- (E) 1 000 000 000 000 000 000: ...
For powers of ten less than 9 (one, ten, hundred, thousand and million) the short and long scales are identical, but for larger powers of ten, the two systems differ in confusing ways. For identical names, the long scale grows by multiples of one million (10 6), whereas the short scale grows by multiples of one thousand (10 3).