How many triangles can you count in this diagram?
Click the yellow button to find out.
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The important thing is not the answer but the method you used to arrive at the answer. Did you have a structured approach? Were you sure that you had the right answer?
There is a printable worksheet to go with this activity for Transum subscribers.
Can you make up a puzzle like this for others to solve?
How many triangles are on the front of this hotel reception desk?
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Other shape counting starters:
Teacher, do your students have
access to computers?
Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to a related student activity.