Question about Casio FX-115ES Scientific Calculator
Your calculator knows only the decimal logarithms log or log_10 and the natural logarithms (ln or log in base e).
So you cannot compute directly the logarithms in any bases other than 10 and e.
A workaround consists in using the relation
log in base b of a number a (log_b (a))
log_b(a)= (log_10(a) ) / (log_10 (b))
or the relation
log_2(0.3)=log(0.3)/log(2) where log is log in base 10
As to the multiplicative factor you had at the beginning of your expression, just multiply the value obtained by one on the formulas above (both formulas will give the same result) by 0.3
Posted on Jul 24, 2010
For fx 991ms users finding log 2 base 1024 press log1024 divided by log2.......
Posted on Feb 21, 2013
For fx-991ms users in finding 0.3 in base two you press log 0.3 divided by log 2(log 0.3/log ).
Posted on Mar 05, 2012
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Posted on Jan 02, 2017
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