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© 2017 by PAMA Global Abacus and Mental Arithmetic Association           

                              

Abacus square roots extraction tutorial video

March 25, 2015

Abacus square roots extraction tutorial video demonstrated by the secretary general of PAMA Global Abacus and Mental Arithmetic Association

 

 

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The 19th PAMA Global Abacus and Mental Arithmetic Association Competition

January 25, 2020

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