Casio FX-300MS - Manual (Page 7)

FX 300 MS Training guide
Logarithms/Natural Logarithms
You can find logarithms, natural logarithms, and antilogarithms.
Examples:
Keystrokes
Display
[log] [100] [=] 2
[ln] [90] [=] 4.49980967
[ln] [ALPHA] [e] 1
[SHIFT] [e
x ] [1] [=] 2.718281828
[SHIFT] [10 x ] [2] [=] 100
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References the Casio FX-300 MS User’s Guide Casio FX-300MS Scientific calculator