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Birthday Puzzles

February 5, 2026 am28 12:07 am

I got a card in the mail with a math puzzle on it. I solve it while walking up the stairs (6 flights, but still…) Here goes:

If each letter represents a digit, what is the true equation?

MA × CA = WWW

There was something about this that made it quick work for me. Do you want to guess what that was?

Later, I shared the puzzle with a few people, and the most interested of them was having trouble seeing the digits as digits (with place value) – he hadn’t done this sort of puzzle before. And we couldn’t really talk. So I made him a puzzle where the idea of being a digit was clearer, and easier for him to figure without me explaining:

DAB
+DAD
ABCD

And the whole group had fun with this one.


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