How Many Triangles 1

A Maths Starter of The Day


How many Triangles?
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Keywords: Starter | Problem Solving | Shape

"This triangle starter is excellent. I have used it with all of my ks3 and ks4 classes and they are all totally focused when counting the triangles."

*Judy, Chatsmore CHS
Thursday, October 12, 2006

 

"All my S1 - S4 classes enjoyed this activity at different levels. S3 have managed to write a formula for the number of triangles in an n-row triangle. Excellent!"

Jo Melville, Aberdeen
Friday, June 22, 2007

 

"A great all-purpose starter for any lesson. Got my little ones on task and ready for their lesson."

Guy Broster, Cumbria, UK
Sunday, September 16, 2007

 

"It is a great starter that could be improved if the demonstration counted along with the shading of the different triangles."

Mr R. Ditta, Stokesley School, North Yorkshire
Wednesday, October 03, 2007

 

"Good starter, gets the mind working. Challenging for a class of year 8's, but fun."

Year 8 and Miss D, Wade Deacon High school, Widnes
Tuesday, September 23, 2008

 

"My Year 8 class got 27!!! It did take us a while though! "

Mrs Myers' Year 8 gang!, Woldgate 'the best' College
Monday, September 29, 2008

 

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world. Click here to enter your comments.

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Excellent, I would like to see more like this
Good, achieved the results I required
Satisfactory
Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 4.5 out of 5 based on 185 votes.
 

  

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Answer

27

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?

Can you make up a puzzle like this for others to solve?