Arithmagons can make ideal starters or plenaries as well as being used for a main lesson activity.

Mathematics, Learning and Technology

**What is an arithmagon? (Updated July 2015)**

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!

These could used with students of all ages. Young children could practice basic skills or students studying advanced Mathematics could look at Calculus or Complex Numbers for example.

The challenge is of course to go backwards…

(**Going backwards in Mathematics** really helps understanding)

Jonathan Hall’s excellent **Flash Maths** site includes **Addagons and Productagons **which will provide an endless supply of arithmagons where the operation can be addition or multiplication; it is also possible to specify the number types required and to choose which parts of the arithmagon are displayed first. This can be displayed full screen making it excellent for the interactive whiteboard.

Nrich have some very useful resources…

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