Tanya Duffy shared a great coordinate geometry activity on a private forum earlier in December.
You might have seen this map featured around the place recently:
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Simon Job — eleventh year of teaching maths in a public high school in Western Sydney, Australia.
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YouCubed is More Than Just Sloppy About Research | Blog
YouCubed maths research
Skyscraper Templates – Thinking Mathematically
A New Favorite Puzzle – Math with Bad Drawings
algebra.js by nicolewhite