I leave it as an exercise for the student to use this exact same table for computing logarithms. You will find the first two columns sandwiching down on your x value and the third and fourth column sandwiching down on your antilog. If your x value is greater than the mean, replace the lower limit for x with the mean and the lower limit for the antilog with the geometric mean. Calculate the mean of the first two columns and the square root of the product of the third and forth columns (also known as the geometric mean). The following method is from the pre-calculus method for calculating logarithms, based on the bisection algorithm: create a table with four columns: x(lower limit), x(upper limit), antilog(lower limit), antilog(upper limit). The fractional part is where you will have the fun. The integer part is just the power of ten, so write that down immediately. Look at the number whose antilog you need.
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