1 / 12 2 / 12 3 / 12 4 / 12 5 / 12 6 / 12 7 / 12 8 / 12 9 / 12 10 / 12 11 / 12 12 / 12 ❮ ❯ .mathematics, positional numeral system employing 10 as the base and requiring 10 different numerals, the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.