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Numeral systems
Arabic Armenian Attic (Greek) Babylonian Chinese Egyptian Etruscan Greek Hebrew Indian Ionian (Greek) Japanese Khmer Mayan Roman Cyrillic Thai Binary (2) Octal (8) Decimal (10) Hexadecimal (16)

The Babylonians used a base-60 (or sexagesimal) positional numeral system borrowed from the Sumerians. Sexagesimals still survive to this day, in the form of degrees, minutes, and seconds in trigonometry and the measurement of time.

A common theory is that sixty was chosen due to its prime factorization 2*2*3*5 which makes it divisible by 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30. Integers and fractions were represented identically - a radix point was not written but rather made clear by context.

The numerals were written in cuneiform, using a wedge-tipped reed stylus to make a mark on a soft clay tablet which would be exposed in the Sun to harden to create a permanent record.

External link

• Babylonian numerals (http://www-gap.dcs.st-and.ac.uk/~history/HistTopics/Babylonian_numerals.html)
• Cuneiform numbers (http://it.stlawu.edu/%7Edmelvill/mesomath/Numbers.html)

da:Babyloniske tal og cifre fr:Numération babylonienne