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how to understand log table

then first take 8231 there are 4 digits so characterstick is 3

now search for log of 8231

the log will be in format 3.log of 8231

similarly find log of 1245

its log will also be 3.something

then substract log of 8231 from log of 1245

suppose your answer is 0.7832

find its antilog

and the number gained is your answer