Hi,
Yes, as you noticed, the terms are thus:
Round Up = No matter what the fraction, you go up to the nearest indicated increment (usually an integer "round up to the nearest whole number").
Example: 8.1 rounds up to 9; 8.9 rounds up to 9; 8.5 rounds up to 9.
Round Down = No matter what the fraction, you go down to the nearest indicated increment (usually an integer "round down to the nearest whole number").
Example: 8.1 rounds down to 8; 8.9 rounds down to 8; 8.5 rounds down to 8.
Round Normally = As long as the fraction portion is less than half-way, you round down to the nearest indicated increment (usually an integer "round normally to the nearest whole number"); if the fraction is halfway or closer to the next increment, you round up to it.
Example: 8.1 rounds down to 8; 8.9 rounds up to 9; 8.5 rounds normally (up) to 9.
Hope that helps.
Thanks,
- Herb
P.S.: I mention increments because sometimes--though not generally in the RPG--we have used "round normally to the nearest half", which makes the cut-off for rounding UP happen at .25, rather than .5.