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'Stone Age Counting' printed from http://nrich.maths.org/
These drawings were found in La Pileta cave in Spain and could be up to $25 000$ years old.
What do you think these drawings represent?
Could they be about counting things?
What might 'stone-age' people count?
Might they be the earliest known number patterns?
You could try and make up your own way of recording counting.
Click here for a poster of this problem