10

 ( Integers ) 

10 ( ten) is the even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system, the most common system of denoting numbers in both spoken and written language.

The number "ten" originates from the Proto-Germanic root "*tehun", which in turn comes from the Proto-Indo-European root "*dekm-", meaning "ten". This root is the source of similar words for "ten" in many other Germanic languages, like Dutch language, German language, and Swedish language. The use of "ten" in the Decimal is likely due to the fact that humans have ten Finger and ten Toe, which people may have used to count by.

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Linguistics

• A collection of ten items (most often ten years) is called a decade.
• The ordinal adjective is decimal; the distributive adjective is denary.
• Increasing a quantity by one order of magnitude is most widely understood to mean multiplying the quantity by ten.
• To reduce something by one tenth is to . (In ancient Rome, the killing of one in ten soldiers in a cohort was the punishment for cowardice or mutiny; or, one-tenth of the able-bodied men in a village as a form of retribution, thus causing a labor shortage and threat of starvation in agrarian societies.)

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Mathematics

• 10 is a composite number and a happy number.
• 10 is the smallest noncototient number.
• There are exactly 10 small Pisot numbers that do not exceed the golden ratio.
  M.J. Bertin (1992). 9783764326487, Birkhäuser. ISBN 9783764326487

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Decagon A ten sided polygon is called a decagon.

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List of basic calculations

10 × x	10	20	30	40	50	60	70	80	90	100	110	120	130	140	150	160	200	250	500	1000	10000

10 ÷ x	10	5	3.	2.5	2	1.	1.	1.25	1.	1	0.	0.8	0.	0.	0.
x ÷ 10	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1	1.1	1.2	1.3	1.4	1.5

10	10	100	1000	10000	100000	1000000	10000000	100000000	1000000000	10000000000
x	1	1024	59049	1048576	9765625	60466176	282475249	1073741824	3486784401	10000000000

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Science

• The metric system is based on the number 10, so converting units is done by adding or removing zeros (e.g. 1 centimetre = 10 Millimetre, 1 decimetre = 10 centimetres, 1 Metre = 100 centimetres, 1 Decametre = 10 meters, 1 kilometre = 1,000 meters).
• The 10th Chemical element of the periodic table is neon.
• The 10th transition metal is zinc.

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Mysticism In Pythagoreanism, the number 10 played an important role and was symbolized by the tetractys.

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See also

• List of highways numbered 10

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Notes

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External links

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