4. Logarithms to Base 10
by M. Bourne
Logarithms to Base 10 were used extensively for calculation up until the calculator was adopted. The concept of logarithms is still very important in many fields of science and engineering. One example is acoustics.
Our calculators allow us to use logarithms to base 10. These are called common logarithms ("log" on a calculator). We normally do not include the 10 when we write logarithms to base 10.
We write
log x to mean log10 x.
Examples
1. Find the logarithm of 5 623 to base 10. Write this in exponential form.
2. Find the antilogarithm of -6.9788
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