Problem 80

Analysis: According to the order of digits in an integer, starting from the right, the first position is the unit's place, the second is the ten's place, the third position is the hundred's place, the fourth position is the thousand's place, the fifth position is the ten thousand's place, ... and the ninth position is the hundred million's place. Based on this, we can solve the problem.

- From the right, the hundred's place is the $\boxed{3\text{rd}}$ position.
- The fifth position from the right is the $\boxed{\text{ten thousand's place}}$.
- The thousand's place is the $\boxed{4\text{th}}$ position.