Hexadecimal numeral system

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The hexadecimal numeral system is a place-value numeral system based on the powers of 16. It is an efficient shorthand for computer programmers to use instead of the binary numeral system.

For example, 11001001 is C9:

$2^7$ $2^6$ $2^5$ $2^4$ $2^3$ $2^2$ $2^1$ $2^0$ 128s 64s 32s 16s 8s 4s 2s 1s 1 1 0 0 1 0 0 1 C 9 $16^1$ $16^0$