Convert from decimal to binary
(base 2) notation:
Raise our base of 2 to a power
Start at 0 and increasing by 1 until it is >=
20 = 1 <--- Stop: This is greater than
Since 1 is greater than , we use 1 power less as our starting point which equals -1
Work backwards from a power of -1
We start with a total sum of 0: