# Hexadecimal

In mathematics and computing, hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A–F (or alternatively a–f) to represent values ten to fifteen.^{[1]}

## A CS50 video

## Basic Definitions

**bit**: A binary digit, either a 0 or 1.**byte**: A group of 8 adjacent binary digits (8 bits), on which a computer operates as a unit**binary**: The binary numeral system is a base 2 numberA unit of abstract mathematical system subject to the laws of arithmetic. system.**denary/decimal**: The decimal numeral system (also called base 10 or occasionally denary) has ten as its base.^{[2]}**hexadecimal**: In mathematics and computing, hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16^{[3]}. Click here for an excellent video about hexidecimal

## A helpful cheat sheet

## What you must know

You must be able to correctly answer the following questions:

- DefineGive the precise meaning of a word, phrase, concept or physical quantity. the term:
**bit** - DefineGive the precise meaning of a word, phrase, concept or physical quantity. the term:
**byte** - DefineGive the precise meaning of a word, phrase, concept or physical quantity. the term:
**binary** - DefineGive the precise meaning of a word, phrase, concept or physical quantity. the term:
**denary/decimal**(they refer to the same thing) - DefineGive the precise meaning of a word, phrase, concept or physical quantity. the term:
**hexadecimal**

## Resources

Click here for a slide deck that covers this topic nicely