This past week I started using MobyMax in my 3rd grade classroom. I absolutely love it! It incorporates Common Core standards, and a variety of subjects, from Math and Reading, to Vocabulary and Grammar. The website it super interactive for my students and they can't wait to get on the computer at school.
Another great thing about MobyMax is that the students can get on the website at home as well as school. There are message boards, games, contests, and more!
I would definitely recommend implementing MobyMax into your K-8 classroom!