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If you take two values A and B, the rules of logs imply:

A * B = log A + log B = log (A+B)

To put it simply you find the of the two values, sum them and then find the value of the resulting log.

and addition is generally easier to perform than multiplication so the result of the logs can be added together. It was used more frequently before the use of pocket calculators and people used tables of logarithms to do multiplication.

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14y ago

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Q: How do you use logarithms to perform multiplication?
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