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10 (ten) is the natural number following 9 and preceding 11. Prefixes for 10 include deca- (Greek) and deci- (Latin).

<< 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >>
Cardinal	ten
Ordinal	tenth
Numeral system	decimal
Factorization	<math>2\cdot5<math>
Roman numeral	X
Binary	1010
Hexadecimal	A

In mathematics

Ten is a composite number, its proper divisors being 1, 2 and 5.

Ten is the base of the decimal numeral system, by far the most common system of denoting numbers both in spoken and written language. For this reason, any number can be instantly multiplied by ten by adding a zero to the end (855 * 10 = 8,550). The basis for the choice of ten is presumably that ten is the number of fingers (digits) of the human body.

Ten is the number of n-Queens Problem solutions for n = 5.

The Roman numeral for ten is X (which looks like two V's [the Roman numeral for 5] put together).

The Chinese word numeral for ten is 十, which resembles a cross.

Ten is the sum of the first three prime numbers.

A collection of ten items (most often ten years) is called a decade.

A polygon with ten sides is a decagon, and obviously, 10 is a decagonal number. But it is also a triangular number and a centered triangular number.

Ten is the smallest noncototient, a number that can not be expressed as the difference between any integer and the total of coprimes below it.

Ten is a Harshad number and a semi-meandric number.

In numeral systems

Base	Numeral system
1	unary	**********
2	binary	1010
3	ternary	101
4	quaternary	22
5	quinary	20
6	senary	14
7	septenary	13
8	octal	12
9	novenary	11
10	decimal	10
over 10 (hexadecimal)		A

In other fields

A decapod crustacean has ten limbs.

There are ten cents in a dime, itself one tenth of a dollar. The word was shortened from decime.

In chess, each side can promote all eight pawns to have a total of ten bishops, knights, or rooks.

People were traditionally tithed one tenth of their produce.

It takes ten to make a minyan.

With ten being the base of the decimal system, a scale of 1 to 10 is often used to rank things, as a smaller version of a 1-to-100 scale (as is used in percentages).

Blake Edwards' 1979 movie .

Something that scores perfectly is "a perfect ten". A person who is extremely attractive and physically flawless is often said to be "a ten", from the idea of ranking that person's appearance and sex appeal on a 1-to-10 scale. E.g. In the movie 10 Bo Derek is supposedly a "10" on that scale.

Counting from one to ten before speaking is often done in order to cool one's temper.

Driving a racing car at ten-tenths is driving as fast as possible, on the limit.

Ten is:

• The atomic number of neon
• The number of carbon atoms in Decane, a hydrocarbon.
• The number of spacetime dimensions in superstring theory.
• Five Dynasties and Ten Kingdoms Period
• House number of Number 10 Downing Street
• ASCII and Unicode code point for line feed
• The number of Commandments from God to man in Mosaic law. (Exodus 20:2-17, Exodus 34:12-26, and Deuteronomy 5:6-21)
• There are said to be ten "Lost Tribes" of Israel.
• The designation of United States Interstate 10, a freeway that runs from California to Florida.
• The title of quite a few albums, including recordings by Pearl Jam and LL Cool J. See Ten (album).
• Historical years: 10 A.D., 10 B.C., or 1910
• A Japanese comic: Ten (comic)

• In rugby union the fly-half wears the 10 shirt.