TLDR
The standard way of using the technique is via tables of common logarithms. The method of using these tables is well known and has been in use for decades. In this article, we will talk about a lesser known method of finding log of a number without using the tables. The accuracy of the result depends on smallness of the value of log(2.7) The exact value is 0.4314 and the error in the result is just 0.03%. For numbers less than 2, multiply and divide with an appropriate factor to bring it close to 5 or 7 in order to minimize errors.via the TL;DR App
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