How many triangle can you count

How Many Triangles 1? How Many Triangles 2? How Many Triangles 3? How Many Rectangles? Rectangles Investigation Icosahedron Mystic Rose. Teacher, do your students have access to computers? Do they have iPads or Laptops in Lessons? Here a concise URL for a version of this page without the comments. How many triangles can you count in this diagram?

Click the yellow button to find out. I have used it with all of my ks3 and ks4 classes and they are all totally focused when counting the triangles. S3 have managed to write a formula for the number of triangles in an n-row triangle. Got my little ones on task and ready for their lesson. Ditta, Stokesley School, North Yorkshire It is a great starter that could be improved if the demonstration counted along with the shading of the different triangles. Challenging for a class of year 8's, but fun.

Mrs Myers' Year 8 gang! It did take us a while though! Mr Sambhi, Solihull Excellent starter. I have used with every class I teach. Mr Cansdale, 7H3 We really enjoyed this activity, we want more of these please! Miss Pankhurst, Norfolk Excellent starter! I have used it with nearly all of my groups and they all got focussed on the task in hand really quickly. I also used a similar one with a 5x5 square grid and asked "how many squares?

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