How many triangles are hidden in the pattern?
What strategy might you use to count them all to ensure you don't miss any out?
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Topics: Starter  Combinations  Problem Solving  Shape
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Other shape counting starters:
How Many Squares 1?
 How Many Squares 2?
How Many Triangles 1?

How Many Triangles 2?  How Many Triangles 3?
How Many Rectangles?
 Rectangles Investigation 
Icosahedron 
Mystic Rose
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=January23 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a related student activity.