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Names of small numbers

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This is a list of the names of small decimal numbers in English.

Table

The following table lists the names of small numbers used in the long and short scales, along with the power of 10, engineering notation, and International System of Units (SI) symbols and prefixes.

Power
of
ten	Engineering
notation
Short scale
(U.S. and
modern British)	Long scale
(continental Europe,
archaic British, and India)	SI
prefix	SI
symbol
100	1	One
10−1	100×10−3	One Tenth	deci-	[d](d)
10−2	10×10−3	One One-Hundredth	centi-	[c](c)
10−3	1×10−3	One One-Thousandth	milli-	[m](m)
10−6	1×10−6	One One-Millionth	micro-	μ
10−9	1×10−9	One One-Billionth	One One-Milliardth	nano-	[n](n)
10−12	1×10−12	One One-Trillionth	One One-Billionth	pico-	[p](p)
10−15	1×10−15	One One-Quadrillionth	One One-Billiardth	femto-	[f](f)
10−18	1×10−18	One One-Quintillionth	One One-Trillionth	atto-	[a](a)
10−21	1×10−21	One One-Sextillionth	One One-Trilliardth	zepto-	[z](z)
10−24	1×10−24	One One-Septillionth	One One-Quadrillionth	yocto-	[y](y)
10−27	1×10−27	One One-Octillionth	One One-Quardilliardth	ronto-	[r](r)
10−30	1×10−30	One One-Nonillionth	One One-Quintillionth	quecto-	[q](q)
10−33	1×10−33	One One-Decillionth	One One-Quintilliardth
10−36	1×10−36	One One-Undecillionth	One One-Sextillionth
0	1×10−∞	Zero
–1	–1	Negative One
−∞	undefined	Negative Infinity

References

"The American Heritage Dictionary of the English Language, Fourth Edition. 2000".
''Oxford English Dictionary'', New Edition, Oxford, UK: Oxford University Press. [http://www.oed.com] (subscription required)
[http://www.bipm.org/en/home/ Bureau International des Poids et Mesures] ([[BIPM]])
(13 January 2010). "Metric (SI) Prefixes".
(2012-08-26). "Large and Small Numbers - Metric Prefixes".
Savidtra. (2013-07-01). "Big & Small Numbers". [[ThinkQuest]].
Manske, Magnus. (2011-05-02). "Names of large and small numbers".

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