Page "Abacus" Paragraph 5
from
Wikipedia
Some scholars point to a character from the Babylonian cuneiform which may have been derived from a representation of the abacus.
It is the belief of Old Babylonian scholars such as Carruccio that Old Babylonians " may have used the abacus for the operations of addition and subtraction ; however, this primitive device proved difficult to use for more complex calculations ".
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