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) =
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perfect !
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pretty close …
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not so close
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