### Wikipedia sayings about when reporting the answer to a mathematical calculation involving addition or subtraction, how does one determine the number of significant digits to report in the answer?

1.**List of Egyptian inventions and discoveries**

problem of the Moscow Mathematical Papyrus asks for a calculation of the surface area of a hemisphere (Struve, Gillings) or possibly the area of a semi-cylinder

https://en.wikipedia.org/wiki/List of Egyptian inventions and discoveries

2.**General der Nachrichtenaufklärung**

deal of non-carrying addition or subtraction had to be done. Note: little information is available from TICOM as to how this device functioned. The Finnish

https://en.wikipedia.org/wiki/General der Nachrichtenaufklärung