Decimal the Roman numerals did, an intermediate base of 5. Notably, the polymath Archimedes (ca. 287–212 BC) invented a decimal positional system in his Sand Reckoner which was based on 10 and later led the German mathematician Carl Friedrich Gauss to lament what heights science would have already reached in his days if Archimedes had fully realized the potential of his ingenious discovery. The Hittites hieroglyphs (since 15th century BC), just like the Egyptian and early numerals in Greece, was strictly decimal. Some non-mathematical ancient texts like the Vedas dating back to 1900–1700 BCE make use of decimals and mathematical decimal
Repeating decimal some other properties of repetends, see also. Various features of repeating decimals extend to the representation of numbers in all other integer bases, not just base 10: For example, in duodecimal, 1/2 = 0.6, 1/3 = 0.4, 1/4 = 0.3 and 1/6 = 0.2 all terminate; 1/5 = 0.2497 repeats with period 4, in contrast with the equivalent decimal expansion of 0.2; 1/7 = 0.186ᘔ35 has period 6 in duodecimal, just as it does in decimal. If "b" is an integer base and "k" is an integer, For example 1/7 in duodecimal: Which is 0.186ᘔ35 (base 12). Note that 10