What was the first known maths mistake?

What was the first known maths mistake?

Kushim is the earliest known example of a named person in writing. The name « Kushim » is found on the Kushim Tablet, a Uruk Period (c. 3400–3000 BC) clay tablet used to record transactions of barley. It is uncertain if the name refers to an individual, a generic title of an officeholder, or an institution.

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Great Animation by William Marler