In mathematics and computing, the hexadecimal numeral system is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9, and "A"–"F" to represent values from ten to fifteen.
Hexadecimal finger-counting scheme
The programmable RPN-calculator HP-16C Computer Scientist from 1982 was designed for programmers. One of its key features was the conversion between different numeral systems (note hex number in display).
The decimal numeral system is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers of the Hindu–Arabic numeral system. The way of denoting numbers in the decimal system is often referred to as decimal notation.
Ten digits on two hands, the possible origin of decimal counting
Diagram of the world's earliest known multiplication table (c. 305 BCE) from the Warring States period
The world's earliest decimal multiplication table was made from bamboo slips, dating from 305 BCE, during the Warring States period in China.
counting rod decimal fraction 1/7
