3: The log is the power!

The mathematical definition of a logarithm to the base 10 (log10) is:

If x= 10y then y = log x

The log of a number is the power to which 10 must be raised to give that number.

For example, 100 = 10 x 10 = 102, (if the superscript is not available this can also be written as 10^2), and so log (100) = 2.

You can use the applet below to practise finding the log of easy (non- messy) numbers.  Keep at it until it becomes very easy!

You can use the applet below to practice finding the log of easy (non-messy) numbers. Keep at it until it becomes very easy!  

log(0.001) =
perfect !
0
pretty close …
0
not so close
0