This is a FREE INTERACTIVE SMARTBOARD Site. If you don't have a smartboard, you can still use it on your computer. I have a touchscreen computer it ROCKS. And, did I mention it's FREE! Many other activities, just happened to be working on place value.
I use math journals in my Math Workshop. I like the idea of using Math Journal Sentence starters with my students. This would serve as a great way to incorporate writing in math and allow students to expand their thinking.