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This is a useful maths site for teaching place value to young children with virtual hundreds, tens and ones blocks. http://ictmagic.wikispaces.com/Maths

This is a wonderful site, like http://www.learningbox.com/Base10/CatchTen.html which we've used for a while in my lab. The problem we've encountered is that sometimes the counting goes off, especially with http://www.learningbox.com/Base10/BaseTen.html. Not sure if it's a Flash bug or what but you really get quizzical looks from the students at times. When it's working, it's fabulous!