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'Count the Crayons' printed from http://nrich.maths.org/

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Take a look at these pictures:


Estimate how many pencils/pens you can see in each one.
What was your method?
How else could you do it?
Is there one way that is particularly useful?  Why?

You could print off these pictures as a Word document or as a pdf.
Photograph Acknowledgements
www.jeremyriad.com
www.fineartamerica.com
www.simplepastimes.com