4 ms·

Please see this follow-up post: Approximation relating lg, ln, and log10 http://www.johndcook.com/blog/2012/11/24/approximation-relating-lg-ln-and-log/ http://

• Evbn 14y ago
  Nice! Useless but fun example: ln 125 is approximately lg 125 - log 125 ~= lg 128 - log 100 = 7 - 2 = 5. Exact answer is close to 4.83, less than 5% error without ever thinking about a fractional value root or log.