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They were calculated using a variety of numerical algorithms that were available at the time. In 1617 and later in 1624, mathematician Henry Briggs published his own log tables, in which he famously used Finite-difference methods to calculate the logarithms.

The log table that we use today, was made a quite a while back. It was John Napier, who first made the log table, but at that time, there was no modern calculators, he himself calculated all the values, it took nearly twenty years for him to do so.

Step 1: Understand the concept of the logarithm. Each log table is only usable with a certain base. Step 2: Identify the characteristics and mantissa part of the given number. For example, if you want. Step 3: Use a common log table. ... Step 4: Use the logarithm table with a mean difference.

Log table (logarithm table) is used in performing bigger calculations (of multiplication, division, squares, and roots) without using a calculator. The logarithm of a number to a given base is the exponent by which that base should be raised to give the original number.

The most common type of logarithm table is used is log base 10. Step 2: Identify the characteristic part and mantissa part of the given number. For example, if you want to find the value of log10 (15.27), first separate the characteristic part and the mantissa part. Step 3: Use a common log table.

He started by taking 54 successive square roots of 10, working to 30 decimal places, until he found the number whose base-10 logarithm is 1/254. Together with all the intermediate results this enabled him to raise 10 to various other fractional powers and create a logarithm table.

What are Log Rules? product rule: logb mn = logb m + logb n. quotient rule: logb m/n = logb m - logb n. power rule: logb mn = n logb m. change of base rule: loga b = (logc b) / (logc a)

The concept of the natural logarithm was worked out by Gregoire de Saint-Vincent and Alphonse Antonio de Sarasa before 1649. Their work involved quadrature of the hyperbola with equation xy = 1, by determination of the area of hyperbolic sectors.

How to Calculate Logarithm of a 5 digit Number Using Log Table?Characteristic = number of digits on the left side - 1 = 4 - 1 = 3.Mantissa (see the row labeled 12 and column labeled 3 of log table and add the mean difference of the same row under 4) = 0.0913.Add them both.

The antilogarithm (also called an antilog) is the inverse of the logarithm transform. Since the logarithm (base 10) of 1000 equals 3, the antilogarithm of 3 is 1000. To compute the antilogarithm of a base 10 logarithm, take ten to that power.