Brain Buster

The caption says kids can solve this brain buster in ten minutes. Not to brag, but it took me less than 30 seconds. What about you? I will post the solution at the bottom. Don't scroll down and look if you don't want the puzzle spoiled for you.

The answer is the total number of closed circles in the number.
1- none
2- none
3- none
4- none
5- none
6- 1
7- none
8- 2
9- 1
0- 1

For example---
415- 0
981- 3
205- 1

Get it?