A few years ago, while browsing for books in PowerBooks, I noticed a book containing plenty of puzzles. I tried solving some of them, but most of them cannot be solved without the aid of a scratch paper. There’s one, however, that I was able to memorize because of the absolute simplicity of the problem. The idea is to distribute the numbers 0-9 in a 2×3=5 equation so that each numbers appear exactly once. There are no hints, but a single digit was already supplied.

It’s a tough problem, admittedly. I had previously solved a similar problem before, admittedly through luck. The problem is to decode the equation BUG + FLY = MOTH, which contains 10 unique letters, meaning the numbers 0 – 9. Multiplication is far more complex than addition because of the carry-overs. Worse, the puzzle appeared not just once, but 5 times, if I’m not mistaken.
Note: If you don’t want to read the technical details and just want to view the answers, just skip the next few pages and head over the last page by clicking on its link.
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