A very easy mentally logarithm way of calculation for all

So, I have found in internet this very short way of mentally calculating logarithms (that is not different of yours @Kinma) and it is very easy to understand for all. The answer is from Mr. Jyrki Lahtonen: https://math.stackexchange.com/questions/1315360/how-to-find-logx-close-to-exact-value-in-two-digits-with-these-methods

[Off-topic] @Kinma I have bought the book De kunst van het hoofdrekenen by your friend Mr Bouman, but I do not find very easy to understanfd, because it’s about congruations :confused:

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