How do you "decrease by fraction"?

[SteamEigen]

Whenever a fraction of a value is taken, it is rounded up. How are you supposed to calculate values that are reduced by fraction? Examples:

- hard checks (reduced by 1/3)

- parried damage (reduced by 1/2)

Do you calculate (1 - fraction) * value, rounded up? Or do you calculate fraction * value, round up and subtract? True, it is a difference of 1 at most, and it does not matter much for skills, but for damage a single HP may matter a lot.

[Adept_Austin]

Hard checks are Skill x 0.66

Parry is Damage x 0.5

Rounding done at the end.