The fastest time to mentally add 200 four-digit numbers is 1 min 9.68 sec, and was achieved by Aaryan Shukla (India) in Dubai, UAE, on 6 December 2024. Aaryan (the 'human calculator') is a serial ...
They get the right answer on the abacus, but when it comes to mental calculation where they look at numbers and calculate in ...
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