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Struggling students are exploring too
I firmly believe that all students deserve to play with mathematical ideas, and that extension is not just for the fast or "gifted" students. I also believe that you don't necessarily need specially designed extension activities to do exploration – a simple "what if" question can easily launch a standard textbook exercise into an exploration.
Trying maths live on Twitter
Once upon a time, I decided I would be vulnerable on Twitter. As part of that, when someone posted a puzzle that I was interested in, I decided that I would not wait until I had a complete answer to a problem before I responded, but instead I would tweet out my partial thinking. If there were mistakes I would leave them there and respond with how I resolved them, rather than deleting them and removing the evidence that I had made a mistake. I wanted the whole process of solving problems to be out there in plain sight for everyone to see.