The duodecimal system (also known as base 12 or dozenal) is a positional notation numeral system using twelve as its base.
base 10
base 10 is a positional numeral system with ten as its base. It uses 10 different digits for representing numbers. The digits for base 10 could be 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.