# How do you evaluate #log 0.001 + log 100#?

##### 1 Answer

Jul 7, 2016

#### Answer:

#log 0.001 + log 100 = -1#

#### Explanation:

The common logarithm

So we find:

#log 0.001 + log 100 = log(10^(-3))+log(10^2) = -3+2 = -1#

Note also that in general we have:

#log(a) + log(b) = log(ab)#

So:

#log 0.001 + log 100 = log (0.001*100) = log(0.1) = log(10^(-1)) = -1#