| M5 Home Page |
| Blitz 2000 | Working with Different Number Bases |
| MathBits | Working with Number Bases |
| Purplemath | Number Bases |
| Belmont Technical College | Decimal to Binary Conversion |
| Infoplease | Binary System |
| RJL | Back to Basics - Binary Numbers and Computers |
| Belmont Technical College | Hexadecimal Conversions |
| Integrated Publishing | Conversion of Bases |
| MathBits | Change a Number from Base 10 to Any Other Base |
| MathBits | Change a Number from Any Base Back to Base 10 |
| MathBits | Convert a Number from Any Base to Any Other Base |
| Purplemath | The Conversion Method: Why Does it Work |
| Cut the Knot | Abacus in Various Number Systems |