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'Shape Times Shape' printed from http://nrich.maths.org/
The coloured shapes stand for eleven of the numbers from $0$ to $12$. Each shape is a different number.
Can you work out what they are from the multiplications below?
This activity is featured in the hands-on Brain Buster Maths Boxes, developed by members of the NRICH Team and produced by BEAM. For more details see here .
Click here for a poster of this problem.