This site offers enrichment problems for grades 5-8 that align with the Saxon lessons. Check out the Math Stumpers for more challenge.
This site offers many interactive activities that align with AR SLEs.
This is an awesome site that walks kids through single and multi-step problem solving by asking them to model the problem with "thinking blocks".
This site has several interactive activities that align with the Saxon lessons.
This is great practice for those who need more rigor with this SLE. After mastering the models and conceptual knowledge of decimals in Q3, this site will allow them to sort numbers from least to greatest including thousandths.
Don't forget to see if Brain Pop has a video that matches the SLE. I recommend printing the quiz and allowing the kids to comlete it before, during, and after viewing.
This site has a variety of animated videos that teach math concepts. You can also print follow up exercises. Be sure to enable pop-ups (tools, turn pop-up blocker off).
A PPT that reviews 5th grade math vocabulary.
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.