What is 57,683 squared?

Mathemagician Arthur Benjamin performs his lightening calculations at TED in 2005.

Working as a casino dealer I was occasionally required to perform detailed multiplication and addition operations in my head when calculating payouts (e.g. 9 x 17 + 13 x 35 + 7 x 11 …) but the magnitude of these calculations and the time taken is unbelievable.

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