Yes! Arithmancy! Though, Treyen did prefer Divination for some reason.

Numbers were...numbers.

The boy smiled, "Awesome! Thank you, Mr. Kapoor" he said, with a nod, and took the first parchment he could take from the bunch he was holding. What numbers? "We're working with Core numbers, Sir, they've been...rather interesting, but the interpretations of my numbers are not too much of my liking" mainly because the textbook interpretation had very little to do with who he truly was, "Those are four Core numbers, but...I'd only like to practice with one of those with you, Sir, and that one is..." he eyed the parchment to see what was already written in it, "...the Expression/Destiny number" he nodded, yes, that's the one.

Surely, Prof./Mr. Kapoor knew something of Arithmancy already, but he sort of explained a bit, "See, that number is supposed to tell us what we're supposed to do in life, and how to accomplish things..." mostly, yes, "...it isn't accurate, of course, and interpretations aren't either...but, I'd like to try it, all I need is your full name, Sir..." another nod, and now a serious face, "...first, middle...and, I already know your last one" after this he smiled.

There.