\input zb-basic \input zb-matheduc \iteman{ZMATH 2016f.00932} \itemau{Reed, Cameron} \itemti{Computing logarithms by hand.} \itemso{Math. Teach. (Reston) 109, No. 8, 633-636 (2016).} \itemab Summary: How can old-fashioned tables of logarithms be computed without technology? Today, of course, no practicing mathematician, scientist, or engineer would actually use logarithms to carry out a calculation, let alone worry about deriving them from scratch. But high school students may be curious about the process. This article develops a straightforward technique for computing common logarithms by establishing a few successive square roots of 10. Because the logarithms of these values are by definition just the power to which 10 has been taken ($1/2$, $1/4$, $1/8$, etc.), these values can be used to construct a table of logarithms in which the increment in the logarithm is $1/2^N$, where $N$ is the number of square roots computed. By interpolating between these accurately computed points, we can build a standard log table. This method should help reinforce rules of logarithms and powers for students. (ERIC) \itemrv{~} \itemcc{F50 N50} \itemut{logarithms; numbers; mathematical concepts; interpolation} \itemli{http://www.nctm.org/Publications/Mathematics-Teacher/2016/Vol109/Issue8/Computing-Logarithms-by-Hand/} \end