That is, the least-significant digit (right-most digit) is of the order of 10^0 (units or ones), the second right-most digit is of the order of 10^1 (tens), the third right-most digit is of the order of 10^2 (hundreds), and so on, where ^ denotes exponent. Decimal (Base 10) Number Systemĭecimal number system has ten symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9, called digits. In computing, we also use hexadecimal (base 16) or octal (base 8) number systems, as a compact form for representing binary numbers. Computers use binary (base 2) number system, as they are made from binary digital components (known as transistors) operating in two states - on and off.
Human beings use decimal (base 10) and duodecimal (base 12) number systems for counting and measurements (probably because we have 10 fingers and two big toes).
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