When you launch the site, you are prompted to choose a grade level:
It will then take you to an organized list of TONS of great activities:
The graphing activities are super cute. Your students can make bar graphs, pictographs and line plots! In Virginia, our state tests assess graphing this way so this site would be excellent practice for our kiddos.
Other activities might require the student to enter the exact answer:
Each problem has a "scratch pad" that students can launch to help them solve the problems.
Definitely add Math Games to your website list if it isn't on there already :)