This represents a decimal count of 0 through 15. Sad but true. Let's regroup here. If you can get this concept, you will have conquered the most difficult part of learning micros. I need to get past one more obstacle, the idea of significance.
Significance means the relative value of one digit to the next.
I'm not trying to insult your intelligence here, but rather to point out the rule behind this. Hence the familiar units, tens, hundreds, and so on. The very same is true for binary. The only difference is the base. Binary is base 2.