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Trachtenberg system
Multiplication algorithm
List of magic tricks
The square of mn, mn being a two-digit integer, can be calculated as. 10 Ă— m (mn + n) + n2. Meaning the square of mn can be found by adding n to mn, multiplied by m, adding 0 to the end and finally adding the square of n. For example, 23 2: 23 2. = 10 Ă— 2 (23 + 3) + 3 2.
Shuffling - Wikipedia ... Shuffling
Multiplication table
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