Interactive Spreadsheets

I've already said that I enjoy working with Excel. This last week I learned a lot about making interactive spreadsheets. By making my own, I was able to work my way through it and learn from my own mistakes. If I had not been able to learn by doing I would not have seen that I needed to choose a date setting or that numbers and letters automatically justify to opposite sides. I believe I would use this type of program in my classroom.