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badminton1
on Feb 14, 2017
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Multiplying and dividing with Hindu-Arabic numeral...
A proficient abacus user can learn how to do math quickly by exploiting muscle memory and imagining the abacus rather than physically using it.
https://www.youtube.com/watch?v=Px_hvzYS3_Y
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https://www.youtube.com/watch?v=Px_hvzYS3_Y