Names of small numbers

Names of small numbers

This article lists and discusses the usage and derivation of names of small numbers.[1]

Table of names

The following table lists English language names of small numbers used in the long and short scales, along with the power of ten, engineering notation, and International System of Units (SI) symbols and prefixes.[2][3][4][5][6][7][8]

Power of ten Engineering notation Short scale
(U.S. and
modern British)
Long scale
(continental Europe,
archaic British, and India)
SI
symbol
SI
prefix
100 1 One One
10−1 100×10−3 Tenth Tenth d deci-
10−2 10×10−3 Hundredth Hundredth c centi-
10−3 1×10−3 Thousandth Thousandth m milli-
10−4 100×10−6 Ten thousandth Ten thousandth
10−5 10×10−6 Hundred thousandth Hundred thousandth
10−6 1×10−6 Millionth Millionth µ micro-
10−9 1×10−9 Billionth n nano-
10−12 1×10−12 Trillionth Billionth p pico-
10−15 1×10−15 Quadrillionth f femto-
10−18 1×10−18 Quintillionth Trillionth a atto-
10−21 1×10−21 Sextillionth z zepto-
10−24 1×10−24 Septillionth Quadrillionth y yocto-
10−27 1×10−27 Octillionth
10−30 1×10−30 Nonillionth Quintillionth

See also

References


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