3 Select the number base. To find the logarithm of a number other than a power of 10 you need to use your scientific calculator or pull out a logarithm table if they still exist. Log b x y y log b x Logarithm base switch rule.
They have special notations.
Find the logarithm with base 10 of number 2. Log b x y y log b x Logarithm base switch rule. The logarithm of a number is an exponent or power. A base ten log is written.