Awesome (CCSS) Math Resource

I stumbled upon this snazzy math resource... Illuminations....it is part of Verizon's Thinkfinity and the National Council of Teachers of Mathematics (NCTM). The lessons are aligned with the Common Core State Standards (CCSS).

Math is so important to me because I struggled with it for most of my education. In college, I finally found my niche and I ended up majoring in it. I promise you my high school math teachers would never believe it. 

I am trying to decide if my new group of kiddos would benefit more from whole group math instruction or math centers...or perhaps a combination of the two...

Either way this site is worth checking out!