It doesn't need to work in the same fashion, if it still comes up with complicated flight paths that X can't follow before Bullseye throws the projectiles. There's zero evidence to suggest that X can mentally track multiple projectiles' while they ricochet around the environment, and there's actually evidence to suggest that he can't.
We don't know exactly how Bullseye calculates his aim, but we do know that it takes far less time than Cho took and that the projectiles would be moving faster, with intent to kill. We know that this type of maneuver can surprise X, that he has trouble compensating and that this is Bullseye's bread and butter.
Math was not necessary. Simply extremely fast aim deductions, executed before X can dumb it down to his level. This is exactly what Bullseye does.