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

$A\times 10^n+B\times 10^{(n-1)}+\cdots +Z\times 10^1+10^0$

For example

$121=1\times 10^2+2\times 10^1+1\times 10^0=100+20+1$

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

$A\times 2^n+B\times 2^{(n-1)}+\cdots +Z\times 2^1+2^0$

For example

$111_2=1\times 2^2+2\times 2^1+1\times 2^0=4+2+1=7$