How I Use It
I use it as extra practice after a lesson has been taught and sometimes as a pre-cursor to a lesson to be taught in the immediate future. It is a great way for me to gauge who has prior knowledge on a topic and who hasn't seen it before.
I like to use this site after I have taught a lesson in math. It is a great way for me to see immediately who is understanding and who needs more instruction. I also like that it causes my students to think deeper, and really apply their math brains.