Originally Posted by Ania
P.S.

The last two classes in Intro to Number Theory they have been focusing on Modular Arithmetic and Abstract Algebra.
http://en.wikipedia.org/wiki/Modular_arithmetic

For those of you mathy parents out there - is this ever encountered in the "regular" curriculum?

I don't know. I didn't experience the regular curriculum myself and my kids have not encountered modular arithmetic at school, except in the form of time-telling.

Cathy