:This article aims to be an accessible introduction. For the mathematical definition, see Decimal representation. The decimal numeral system (also called base ten or occasionally denary) has ten as its base. It is the numerical base most widely used by modern civilizations. Decimal notation often refers to a base-10 positional notation such as the Hindu-Arabic numeral system; however, it can also be used more generally to refer to non-positional systems such as Roman or Chinese numerals which are also based on powers of ten. Decimals also refer to decimal fractions, either separate...

Kaktovik Inupiaq numerals Inuit, like other Eskimo languages (and Celtic and Mayan languages as well), uses a vigesimal counting system. Inuit counting has sub-bases at 5, 10, and 15. Arabic numerals weren't adequate to represent the base-20 system, so students from Kaktovik, Alaska came up with an Inuit numeral system that has since gained wide use among Alaskan Iñupiaq, and is slowly gaining ground in other countries where Inuit is also spoken. The numeral system has helped to revive counting in Inuit, which had been falling into disuse among Inuit speakers due to the prevalence of ...