Hexadecimal is a numbering system that uses 16 distinct symbols to represent values, for purposes such as efficiently encoding binary numbers. The document explains how to:
1) Convert positive decimal numbers between 0-255 to 2-digit hexadecimal equivalents and vice versa.
2) Convert binary numbers to hexadecimal by breaking them into groups of 4 bits and representing each group as a single hexadecimal digit.
3) Convert hexadecimal numbers to binary by representing each hexadecimal digit as its 4-bit binary equivalent.
The document provides examples and exercises to help the reader practice converting between decimal, binary, and hexadecimal representations.
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