Exercise Your Brain With This Mathematics Blackboard Pop Quiz Clock

We’ve always had this thing for unusual clocks and watches, and while you might have seen something like this Mathematics Blackboard Pop Quiz Clock already, how often do you see one on sale?

It’s going for only $21.49 (as opposed to $31.99) on Amazon, but there are only 20 left in stock so I suggest you hurry up and order yours now. Can you think of a better way to tell the time this year?

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