The Count Me in Too website is worth a look. It is informative and offers practical advice for class teachers.
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Count Me In Too is a project operating across New South Wales, Australia. It is designed to assist teachers broaden their knowledge of how children learn mathematics by focusing on the strategies students use to solve arithmetic tasks.
The project aims to improve the educational outcomes in mathematics for all students through professional development of teachers. It achieves this by increasing teachers’ understanding of how children develop increasingly sophisticated ways of solving arithmetical problems. The research-based learning framework used in the project provides direction for teaching and learning.