A common feature in many tabletop games is that of fractional numbers. Commonly these come in halves, but they can also frequently be thirds. There are even games that ask you to use square roots in some situations, so you can really end up with just about any rational non-whole number.
Non-whole numbers aren't convenient to work with in games, so players are most often asked to round these numbers. Typically, games will have a consistent method of "Up" or "Down" but I remember one 90s era game that had three different rounding methods requested within the character creation process alone: "Up", "Down", and "To the nearest whole number".
I was never sure if the designers felt strongly about how to arrive at the desired whole number, or if they were just having a laugh.