10

This article is about the number. For the years, see 10 BC and AD 10. For other uses, see Ten (disambiguation). 10. Digital object identifier 10 decimal 10 1, 2, 5, 10 X, x deca-/deka- deci- Chinese numeral 十，拾 Hebrew י (Yod) Khmer ១០ Armenian Ժ Tamil ௰ Thai ๑๐ Devanāgarī १० Santali ᱑᱐ Bengali ১০ Arabic & Kurdish & Iranian ١٠ Malayalam ൰ Egyptian hieroglyph 𓎆 Babylonian numeral 𒌋 10 (ten) is the natural number following 9 and preceding 11. Ten is the base of decimal numeral systems, the most common systems for denoting numbers in both spoken and written language. The English name for the number "ten" originates from the Proto-Germanic root *tehun, which in turn comes from the Proto-Indo-European root *déḱm̥. This root is the source of similar words for "ten" in many other Germanic languages. The widespread use of decimal systems is believed to be because humans have ten fingers and ten toes, which people may have used to count by. Linguistics A collection of ten items (most often ten years) is called a decade. The ordinal form is tenth. The adjectives decimal and denary refer to systems or quantities based on ten. * 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 decimate. (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.) Mathematics thumb|200px|The tetractys|class=skin-invert-image As the base of the decimal numeral system, powers of ten are used to express orders of magnitude and form the basis of common scientific notation. 10 is a composite number and a happy number.Weisstein Eric W. Happy Number https://mathworld.wolfram.com/HappyNumber.html#:~:text=The%20first%20few%20happy%20numbers,97,%20100,%20... 2025-04-25 mathworld.wolfram.com en 10 is the smallest noncototient number. N. J. A. Sloane Neil Sloane https://oeis.org/A005278 A005278: Noncototients The On-Line Encyclopedia of Integer Sequences OEIS Foundation 2016-06-01 Ten is the fourth triangular number and the third tetrahedral number: This representation underlies the tetractys, a triangular figure of ten points important in Pythagoreanism. A ten sided polygon is called a decagon. List of basic calculations Multiplication12345678910111213141516202550100100010 × x102030405060708090100110120130140150160200250500100010000 Division12345678910111213141510 ÷ x1053.32.521.61.4285711.251.110.900.830.7692300.7142850.6x ÷ 100.10.20.30.40.50.60.70.80.911.11.21.31.41.5 Exponentiation1234567891010x10100100010000100000100000010000000100000000100000000010000000000x10110245904910485769765625604661762824752491073741824348678440110000000000 See also Mathematics References External links ten zero Category:Integers