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or anything else which might halve damage. How do we deal with odd numbers?

1/2=0.5 and 3/2=1.5 for example.

I'm wondering if there is any canon answer anywhere about whether to round fractions up or down.

I've always wondered that myself. It's interesting to see what a PDF search will turn up, so I searched almost all the core rulebooks using the terms "round up" and "round down." There were random rules for rounding both ways, but they dealt with various powers or circumstances. There was one game that stood out, however. In Ninjas & Superspies, on page 126 (Hand to Hand Combat), it discusses resolving combat. It provides an example of a defender rolling with a knockout punch and in the example, it says to "always round up for fractions." Why is Ninjas & Superspies different than everything else? I suspect because it was written by Erick Wujcik and almost all the other games were written by Kevin. Different authors bringing their different perspectives, styles or nuances, I suppose.

I'd personally change the rounding to be favorable to what was being attempted, so in this case I'd round down (that likely isn't canon, however).

You round down the amount of damage taken, because there's no way to take a partial point of damage, and there's no rule increasing that partial point to a full point.

Hm... are we technically told you can't take a partial point of damage? I can't remember ever reading that, so perhaps we could just track 0.5 damage?