What is a "logarithm"?

Soldato
Joined
21 Oct 2002
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7,430
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Bexhill on sea
My daughter asked me this and it stumped me. I can barely remember using them 32 years ago in college. lol. Shes confused that you can convert normal numbers to logs, and to multiply, you add, to divide, you subtract, then convert the number back again from a "log". that question even confused me. Can anyone help me out here?
 
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