Originally Posted by Aufilia
DD did the Noetic Learning Math Contest last year:
http://www.noetic-learning.com/

We're planning to do it again. 2 local math centers hosted it last year, and at least 1 of them didn't require us to have taken their classes to enroll in the contest.
That's interesting. The trouble (for us, as homeschoolers) is it looks like a school-based/team contest. The ones I mentioned are individual, with no school connection required.