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Decimal is the number system we are used to working with and is base 10, with 10 digits from 0 to 9. Binary is a base 2 number system with just two digits - 0 and 1.
Take the number 11 (Decimal). How do we convert it into Binary?
Write out the following grid of numbers. Note that it starts (from the right hand side, with 1, and then each number is doubled)
Consider which numbers in the grid would add up to 11. In this case 8 + 2 + 1. Put a 1 under each of those numbers and a zero in every other cell.
Copy out the binary sequence. The below binary sequence is 11