The numbers at the circles add up to the numbers
in the rectangles between them.
What number does each question mark represent?
Scroll down the
page to find the
link to the interactive, self-checking Arithmagons.
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The numbers at the vertices are 10, 16 and 22.
Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.
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Teacher, do your students have
access to computers?
Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to a student version of this activity with many different levels of difficulty.
If your pupils do not have access to computers there is a printable set of Arithmagon worksheets here: