Thank you Dan Meyer.
He has put together some great resources that can be downloaded and used for topics in algebra and geometry. Some seriously good stuff here that compels learners (and teachers!) to uncover the conceptual load of mathematics, makes links to everyday things that kids can get excited about and questions that develop mathematical reasoning.
Algebra is here.
Geometry is here.
Enjoy the ride!!
And if you haven’t caught up with his excellent blog then go here. You will find a wealth of inspiration there.