Arithmetic Course/Number System

Number of Base Ten

The number system in use of the ordinary real life is number in of base ten consists of digit from 0 to 9 . Any number greater than 9 can be expressed as

$A x 10^n + B x 10^(n-1) + ... + Z x 10^1 + 10^0$

For example

$121 = 1x10^2 + 2x10^1 + 1x10^0 = 100 + 20 + 1$

Number of Base Two

The number system in use of the ordinary real life is number in of base ten consists of digit from 0 to 1 . Any number greater than 1 can be expressed as

$A x 2^n + B x 2^(n-1) + ... + Z x 2^1 + 2^0$

For example

$111 = 1x2^2 + 2x2^1 + 1x2^0 = 4 + 2 + 1 = 7$