Neatorama Posts Tagged "abacus"
Amazing Skill: Manipulating a Mental Abacus

[](Vide... in their minds and with gestures an imaginary abacus . This technique helps them keep the numbers in th...
Electronic Abacus

The sorocal is a retro-cool Japanese marvel of...  ...ancient technology: a calculator combined with an abacus . Sharp made four models in the seventies and eigh...
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