D.I.Y. (Draw it yourself) Calculator

From the website:

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Math may not be much fun, but with the new D.I.Y. Calculator it becomes more interesting.

Starting with a blank sheet, you can doodle away designing a unique calculator of your very own.

OK — you still have to put the numbers in the right places, but the included template shows exactly where everything needs to go.

You can't get a more personal personal calculator and you definitely can't get one like yours anywhere else.

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£6.99.