If your children like mathematical conundrums like Sudoku or love the beauty of algebra, then they will find arithmagons truly fascinating. The 23 slides in this PowerPoint presentation, which can last several mornings, introduce children to these polygon number puzzles before deepening their understanding by applying algebraic formulas or using more complex shapes.
Not only will your children enjoy being challenged with identifying missing numbers but they will also be challenged in trying to find a method for their solution (and in my experience, some will even find their own which work).
Although aimed directly for those teaching Years 5/6, it is also relevant for any KS2 or Y7 teacher.
I will always appreciate some feedback on the content of the lesson and any improvements that could be made.
If you like these lessons, please visit my shop for other resources and lessons aimed at upper keys stage 2 and lower key stage 3 at https://www.tes.com/teaching-resources/shop/RobLlewellyn
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