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November 20, 2025 7:04 pm (EST)
Applying Modular Arithmetic in Accounting
What does modular arithmetic have anything to do with accounting? I didn’t know until this sentence appeared in the textbook of my Grade 10 accounting course: “In a bank reconciliation, if the two sides don’t match, take the difference and see if it is divisible by 9. If it is, then a possible source of…
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November 20, 2025 7:04 pm (EST)
Unforgettable mathematical problems: Episode II
Another unforgettable problem is the following problem from the Canadian Mathematical Olympiad in 1989. Although I did not participate in that year’s competition, I came across it as I was preparing for the competition in subsequent years. It is memorable not only because the problem is elegant but also from the personal connection with the…
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November 20, 2025 7:04 pm (EST)
Hail Cribbage!
My favourite card game is cribbage. I have played online for over 20 years. While it is not as well-known as other card games such as bridge or gin rummy or euchre, I enjoy the game for its combination of strategies, application of basic probability theory and psychology. Of course, as with many other card…