Binary to Decimal Conversion

Binary: It´s the representation of a number using 1 or 0.
Decimals: It´s the numeric system we use, 0,1,2,3...9,10,...

How to convert from decimals to Binary? : Divide the number by 2 to it´s minium expression

How to convert from binary to decimal?: Add the numbers that are represented by 1

Extra : Octal to decimal conversion

How to convert from decimals to octal?: Divide the number by 8 to it´s minium expression.