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##log_{10}(9)## = ???

I asked my teacher about how to begin approaching that kind of computation of logarithm.

He was not very interesyed in explaining the procedures of estimating the value of the log. Perhaps the procedure went beyond the scope of our math course at the time.

For sure, I think John Napier did not have a calculator which he could just push some buttons. Evidently Napier used some method to compute values which he made into logarithm tables so the logarithm tables could be used by other people to perform calculations.