Numbers
everywhere
you look
Elegant puzzles drawn from the math hiding in everyday life. A new challenge, every two weeks.
The Cards That Count for Nothing... Or Do They?
Card counting squeezes a whole shoe into one number — and the famous Hi-Lo system scores three of the thirteen ranks as a flat zero. Wasteful? We test whether folding the 7, 8 and 9 back in builds a sharper count, and find that doing *less* wins.
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The Cards That Count for Nothing... Or Do They?
Card counting squeezes a whole shoe into one number — and the famous Hi-Lo system scores three of the thirteen ranks as a flat zero. Wasteful? We test whether folding the 7, 8 and 9 back in builds a sharper count, and find that doing *less* wins.
The Pen That Cried Wolf
A counterfeit-detector pen is 99% accurate at catching fakes and almost never misfires. It just flagged a customer's $100 bill. So why is the bill still almost certainly real?
Up Like a Rocket, Down Like a Feather
Five price signals, five right triangles, one angle that tells you when the (asset) rocket is too vertical to stay aloft. A trader's intuition expressed in tangents.
Mathematics is already
happening around you
RecreateMath presents challenges rooted in the genuine mathematics of ordinary moments — the arc of a thrown ball, the rhythm of traffic, the probability of a cancelled flight.
Each puzzle is crafted to be solvable with curiosity and a pen, yet deep enough to reward deeper exploration. No prerequisites. Just a love of thinking clearly.
A new puzzle appears every two weeks. Subscribe and it arrives in your inbox.