People will RP how they RP. There is no specific guideline on assumed, genetic or given knowledge in the game. The wiki is arguable. While its accepted, at least a portion of players would rather it wasn't. The easiest way to RP, is always with the groups demands, rather than as a solo player.
That said, mathematics, weights, directions all seem mostly standard, making the average cantrian more like a synthetic artificial intelligence, than an organic being, given their rather mysterious and interpretable sudden appearance from nothing and massive base of normally inaccessable knowledge and processing without tools of the kind.
Not that this is bad, in fact the science fiction weirdness of cantrian life actually provides a sort of fantasy charm I think
Try trading 29 grams of steel for 60 kilos of baked potatoes in real life without any scales!

