Common Logarithm is defined as the logarithm with base-10.There are two parts of common log of any number i.e Characteristic and mantissa.How to Find the characteristic and Mantissa of a number is explained with example.Characteristic can be found by just visual inspection and Mantissa can be found by using Common log table.In order to find the logarithm of a number by using log table,following steps must be followed:
1) Round off the number to 4 digits.
2) Find the characteristic by visual inspection.
3) Find Mantissa by using log table.
4) Combine characteristic and Mantissa to get the Common logarithm of any number.
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