For example two numbers can be multiplied just by using a logarithm table and adding. In this case we can use the reverse of the above identity. Note the above is not a definition merely a pithy description.
1 Multiplication inside the log can be turned into addition outside the log and vice versa.
Therefore 3 is the logarithm of 8 to base 2 or 3 log 2 8. For example what is 671 217. A mathematical operation of adding a logarithmic term to another logarithmic term is called the addition of logarithmic terms. Adding Subtracting Logarithms Logarithms.