HP 300s Scientific Calculator - Manual (Page 38)

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• “In(“ is a natural logarithm function with base .
• You can also use the
 key when inputting an
expression with the form of “logmn” while using Math
format.
Example: log
2
16 = 4
      
     (,)
   
Note that when you must input the base (base m) when using
the
 key for input.
 log16=1.204119983
    
Note: A base of 10 (common logarithm) is used if no base is
specified.

ln90(=log
e
90) = 4.49980967
    
Ine= 1
   (e)  
e 10 =22026.4659
  (  )   
e