I saw again on TFC two or three street vendor kids extracting - TopicsExpress

I saw again on TFC two or three street vendor kids extracting square roots of perfect square numbers mentally. Multiplying 2 digit numbers in your head is not too easy to do for engineers, much less with kids, so I figured those kids really have the aptitude to do this task. Still I knew there must be some mental trick and basic arithmetic operations they must be doing to come up with the correct answers, so I searched and found this. Maybe there is a better way. Still youll see it needs some doing and those kids must be quite gifted. https://youtube/watch?v=WNJ2dCavUrA

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