Ask Uncle Colin is a chance to ask your burning, possibly embarrassing, maths questions — and to show off your skills at coming up with clever acronyms. Send your questions to email@example.com and Uncle Colin will do what he can.
Dear Uncle Colin,
How do you multiply big numbers like $2158 \times 1812$? I try to do it using the column method or the grid, but I always make mistakes.
— A Desperately Desired Error Reduction
Hi, ADDER, and thanks for your message!
I’ve been playing with something midway between the grid and the column recently, as it happens. I’ll show…
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