This site offers a variety of interactive animated videos. Be sure your pop-up blocker is turned off. (in tools)
Scroll down to How Does Your Pattern Grow for growing patterns practice.
This site offers enrichment problems for grades k-4 that align with the Saxon lessons. Check out the Math Stumpers for more enrichments.
This site offers many interactive activities that align with AR SLEs.
Internet 4 Classrooms
Though this isn't a state specific site, it's very easy to navigate to find links for most SLEs. If you don't find what you need, be sure to search a few grade levels above and below as there are more resources there. There's also a search option at the bottom.
This site will let you practice number sense, mental computation, and logical reasoning.