What is an arithmagon?
Clearly, the numbers in the rectangles are the sum of the numbers in the adjacent circles. Of course, there is no need to use addition and no need to use triangular arithmagons!
A revised and completely updated post can be found here.
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Reblogged this on Mathematics – Starters and Plenaries and commented:
Arithmagons can make ideal starters or plenaries as well as being used for a main lesson activity.
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The ideas are indeed endless Anja – glad it’s helpful.
Fantastic resource. I love flexible resources like this one – can easily be amended to be used from very early age (my 5yr son got completly hooked and solved the NRich examples in no time) but offers frame for much more (love the Complex idea, but even working with negative numbers, fractions etc….the ideas are endless!)
Thanks for sharing!