Decimal
Decimal numeral system, also known as denary or base 10, is the numerical base widely adopted in society and commonly referred to as the Hindu-Arabic number system. This base 10 positional notation is also applicable even in non-positional schemes like Roman or Chinese numbers for their having the powers of ten.
Both hardware and software utilizes inherent representations of decimal numbers in storing numerical values and performing arithmetic functions. This is for the computer to perform exact calculations which are not possible with binary fractions.