1. Binary Numbers
The Binary number system is derived from Base 2. In base 2 there are only 2 numerical options 0 and 1. The computer sees these as Off and On respectively.

2. Binary and Decimal
Using this information we can build a conversion table similar to the one utilized in the Base 10 numbering system.

3. Binary Conversion Table

4. First Example
207 =

5. Second Example
201 =

6. Third Example
122 =

7. Fourth Example
56 =