Question about Casio FX-115ES Scientific Calculator

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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_b(a)= ln(a)/ln(b)

log_2(0.3)=log(0.3)/log(2) where log is log in base 10

Similarly

log_2(0.3)=ln(0.3)/ln(2)

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

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For fx 991ms users finding log 2 base 1024 press log1024 divided by log2.......

Posted on Feb 21, 2013

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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

Casiodisplay format (Disp) settings while the calculator is in the BASE ... Be sure to checkthe current calculation mode (SD, REG,. COMP ... Use [ and ] to display the expression 4 + 4. Press A ... want to perform scientific function calculations. COMP .

Dec 03, 2015 | Casio Office Equipment & Supplies

I checked in the manual and found that this calculator does not support Base-N calculations. On the FX-991ES Plus, which has a Base-N mode, fractions , exponents, and other floating points are not supported. The non-integer part is chopped off.

Jan 23, 2014 | Casio FX-300MS Calculator

On a fx-991MS? With many other models, including the fx-991ES, I'd say you have the calculator in binary mode but the 991MS doesn't have such a mode.

Aug 03, 2013 | Office Equipment & Supplies

Press MODE 4 to enter the BASE-N mode. Select the input base. Enter the number. Press =. Select the output base and see the result.

Jun 11, 2012 | Casio FX-115MS Plus Calculator

there is one button ab/c beneath CALC... if u want to calculate 7 mod 4 then... u should press 7 then ab/c 4 and equal to

u get 1,3,4 and ans is center number... result=3..

u get 1,3,4 and ans is center number... result=3..

Jan 16, 2011 | Casio FX991MS Scientific Calculator

Hello,
There is a key for that, the one labeled [ln] for natural logarithm. For log in base 10 use the key [LOG]
[LN] 10 [ENTER] gives 2.302585093.
As you certainly know, you cannot take the logarithm of a negative number, nor of Zero.

Hope it helps.

Hope it helps.

Nov 01, 2009 | Casio FX-300MS Calculator

you need the change of base formula:

log base b of m is ln m / ln b

So- to find log base 2 of 8, simply find ln8/ln2

(from Wikipedia - the proof also follows if you want to go look it up)

While there are several useful identities, the most important for calculator use lets one find logarithms with bases other than those built into the calculator (usually log*e* and log10). To find a logarithm with base *b*, using any other base *k*:

log base b of m is ln m / ln b

So- to find log base 2 of 8, simply find ln8/ln2

(from Wikipedia - the proof also follows if you want to go look it up)

While there are several useful identities, the most important for calculator use lets one find logarithms with bases other than those built into the calculator (usually log

Oct 06, 2009 | Casio FX-300MS Calculator

there is one button ab/c beneath CALC... if u want to calculate 7 mod 4 then... u should press 7 then ab/c 4 and equal to

1, 3 ,4 which is 4*1=4 and 7-4=3 remainder...

1, 3 ,4 which is 4*1=4 and 7-4=3 remainder...

Jun 29, 2009 | Casio FX-115MS Plus Calculator

In any scientific calculator log2(n) can be calculated with either ln or log function as
follows

Log2(n)= ln(n) / ln(2)

Or

Log2(n)=log(n) / log(2)

both will give nearly the same answers

Log2(n)= ln(n) / ln(2)

Or

Log2(n)=log(n) / log(2)

both will give nearly the same answers

Dec 08, 2007 | Casio FX-300MS Calculator

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