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I'm at a private school that is full of great people but kind of a sleepy curriculum. 40% of the teachers are very experienced and very stuck in their ways. We are looking at changing our math curriculum which is heavy worksheets and very light on manipulatives. I've done research on best practices and brought out my textbooks about math instruction, all of them support the need to teach math hands on. Without making the tenured teachers think that I am trying to cause a revolution, how can I politely express concern?