One disadvantage of using an abacus is that it may be slower than using modern electronic calculators for complex arithmetic operations. Additionally, the physical manipulation of beads on the abacus can be cumbersome and may lead to errors in calculation, especially for those who are not proficient in its use. Lastly, the abacus may not be as versatile as electronic calculators in performing advanced mathematical functions or storing and recalling previous calculations.
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The Chinese abacus
Abacus was invented by the Chinesethe abacus was also known as the first computer
The abacus was originated in China in 3000 B.C.(:
Asiana Abacus was created in 1991.