"Russian" Multiplication -- this is fun

soulsinging said:
This sort of things reminds me of how much I once enjoyed math puzzles.
Click to expand...
My sister got me 'The Ultimate Mathematical Challenge', a book that has a puzzle for every day of the year + crossnumbers and other odd challenges inbetween.

I'm on week 7 and loving it!
 
Ernest T. Bass knew a thing or two about mathematics...


Same did those Kettle geniuses...


K2
 
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