2 ms·
A proficient abacus user can be faster than a proficient calculator user in tasks involving addition and subtraction. This is a motivation for abacus/calculato
by partycoder 8y ago
A proficient abacus user can be faster than a proficient calculator user in tasks involving addition and subtraction.
This is a motivation for abacus/calculator hybrids, http://retrocalculators.com/digicus.htm http://retrocalculators.com/digicus.htm