[@Voltus_Ventus]
Well he would definitely be a shrewd accountant and merchant, but those skills are more far reaching than simply "good at numbers." Imogen can do multiplication and division, but that's specified to calculating boiler pressure and engine torque than figuring out interest on a loan, same way that I'm sure Ash can do some math, but something more specified to soldiering, like, I dunno, counting ammo crates maybe. I may be grasping at straws a bit with that one though, but my point still stands that Nikola would definitely be better at advanced mathematics than the others, but not just best at numbers in general.