What is a logarithm?

  • Google+ icon
  • LinkedIn icon

In simple terms a log is asking what power do I need to raise the base to to get that answer.

For example log232.

In this case the "base" is 2.

So what power do you have to raise 2 to, to get 32?

The answer is 5 because 25=32.

Therefore log232=5

Another example log381=4 because 34=81.

Janhvi S. Uni Admissions Test .UKCAT. tutor, A Level Maths tutor, A L...

About the author

is an online A Level Maths tutor with MyTutor studying at Kings, London University

Still stuck? Get one-to-one help from a personally interviewed subject specialist.

95% of our customers rate us

Browse tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss