Quandaries and Queries 

Name: david
Who is asking: Student
Question: Hi David, One plus one is two, so what is going on if you write two as 10? (One warning here. Read 10 as onezero not ten. It's not ten, it's two but written onezero.) One place that the number two is written 10 is in base 2 arithmetic. I want to say something about base 10 arithmetic first.
In base 10 arithmetic we have ten symbols for digits. They are 0,1,2,3,4,5,6,7,8, and 9. We write the counting numbers using these symbols.
At this point we run out of digits and the solution is to place the smallest nonzero digit in the second column and start again with 0 in the first column
If you are working in base two you only have two symbols for digits, 0 and 1. Thus if you start to write the counting numbers you run out of symbols much earlier
The solution is the same as it was for the base ten representation, place the smallest nonzero digit in the second column and start again with 0 in the first column
Again you have run out of digits, (In base 10 this happens at nintynine.) so place a 1 in the next column and continue
I hope this helps, Penny 

