Each pie contains the same four numbers, but multiplied by the central number.
Use your maths deduction skills to try and find all the values.

You can Print out sheets of pies here, or alternatively Play it in your browser.

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What I Didn't Do

Get much sleep.
The idea for this one pounced into my head just after midnight, and it took until about 3 in the morning before I'd done it.
It's turned out fairly well, though.
.. I think!
Until the day it decides to generate an impossible set of puzzles!!