There are 10 kinds of people in the world: those who know binary, and those who don't. The number '10' represents '2' in binary. Unlike denary, bianry's base is two, so we need only two symbols to represent a number in binary, which are - you guessed it - 0 and 1. To illustrate, 1001102 = 1 × 25 + 0 × 24 + 0 × 23 + 1 × 22 + 1 × 21 + 0 × 20. (To convert to denary, simply add up the terms of the expanded form.)
As you can see, to represent unsigned integers (i.e. real numbers with no fractions, decimals or negatives) in 0s and 1s is very simple - simply take the binary form of the number.
The gizmo on this page does pretty much the same thing as the last one, but this time it deals with binary numbers and converts to denary at the end.
Expanded Form =