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What are the negative effects of the abacus?
Abacus won't keep consist results sometimes for large calculations of numbers.Abacus is heavy so it is difficult to carry.It takes so much time to learn the things in Abacus.May 24, 2019
Abacus won't keep consist results sometimes for large calculations of numbers.Abacus is heavy so it is difficult to carry.It takes so much time to learn the things in Abacus.May 24, 2019