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If you have a number such as 345700, first write it in scientific notation. That would be 3.457*10^5. The 5 exponent is the whole part of your logarithm. Log tables leave out decimals as they are assumed. So look up 345 in the column marked N. Then go across to the column with the 7. The table may not repeat all of the digits so check to see if the first one or two digits are written in their own column. The remaining digits will be under the 7. So you get 5.538699. You need to take care though working with fractions as the tables assume positive exponents and you will have to subtract instead of adding

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Q: How you see log table give a example?
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