# How to calculate log value in calculator with different base value

I want to know how to calculate in calculator "casio fx-991ms" fx-991ms" to calculate log value

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• Anonymous Dec 14, 2007

how to calculate log value in calculator with different bases

• Anonymous Mar 28, 2008

yha problem is many

can u show function of casio fx991MS calculator

for eg. linear programming, simplex method, transportation problem, matrix, inverse, equation etc,

• Anonymous Apr 02, 2008

I don't know how can I change the base for log on casio "fx-991ms".

• melindez Apr 16, 2008

i have the ti89 how do i calculate log problems with different bases

• lshelton May 07, 2008

from casio fx300ms - how do you calculate antilogarithms that are written as the following example: 8.9932-10 and get the answer of .09845?

I have tried using shift, 10x, 8.9932 - 10 = and get 984,464,354 - I cannot figure out how to get the decimals in the correct place - help

• Anonymous Oct 26, 2008

how to work out logs in different bases

• Anonymous Dec 02, 2008

On the Casio fx-300MS, how do I calculate log values? For instance, if the problem I am looking to solve says log 4 ^2.

• mohitrok98 Aug 20, 2012

how to solve log2

• Anonymous Mar 23, 2014

how do you calculate fire resistance levels

• Anonymous Mar 25, 2014

calculate pension benefits

• Anonymous Mar 26, 2014

symbol of theta

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### Anonymous

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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

Posted on Apr 24, 2009

### Anonymous

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To Ishelton- I think you are just messing up on your order of operations when entering it into the calculator. What I assume you meant was 10^(8.89932-10), but instead the calculator sees it as (10^8.993) - 10.

If you want to calculate a different base other than ten, then just use your log rules, and its easy as pie in your head.

lets see if I remember this...

take the base of the log and have it equal to the other side of your equation and raise that to the power of the initial value here's an example and quick log lesson:

Log(base x)4 = 8 so that the the x is the base or subscript of the log when you look at it visually.

this means you will have x^8 =4

then you know that we will have 8 log x = 4

if you know the base value and dont know the exponent, its the same thing

Log(base 7) 4 = x

7^x = 4

x Log 7 = 4

x =4 / Log7

and Ill give a final example for the hell of it if you really struggle with basic algebra.

Log (base4)x =5

4^5 = x
x = 1024

There is no need for a calculator to have the ability to do logs of any base other than 10. All the work can be done in your head faster than you can type the base in anyways.

The work above SHOULD be correct, as I'm just remembering off the top of my head, I don't have my notes from that course on me atm.

Posted on May 06, 2009

### Anonymous

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(log(1870)-log(100)
________________ =
(log(40,000)-log(100)

Posted on Dec 10, 2010

### Anonymous

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(log a)2_(log b)2=log(a/b).log(ab)

Posted on Aug 11, 2009

### Anonymous

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Log (base 4) 3 what is the value<br /> <br />

Posted on Aug 19, 2010

### Anonymous

Can anyone please tell me how to calculate the adjoint of a matrix on fx 991ms ???

Posted on May 28, 2008

### Anonymous

To calculate logb to base a,perform logb /loga

Posted on May 17, 2008

### Anonymous

How to use 991ms in calculus

Posted on May 15, 2008

### Anonymous

Sdf lsdfklsdf just treysfsdlf
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Posted on May 12, 2008

### aliogoemeka

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If u want to calculate matrice using casio fx-991ms calculator. First u have to put ur calculator in the matrix mode simply by pressing mode mode mode 2 this put ur calculator in a matrix mode.then press shift 4,ur calculator will display Dim Edit Mat,if u should scroll right it would display Det Tran. To calculate matrix first u have to put in the dimension of the matrice which u want to calculate e.g for a 2x2 matrix press shift 4 and 1 it will display A B C press 1 to put in the dimension of matrix A,for a 3x3 matrix press 3=3 then slot in then value the matrix.

Posted on Feb 24, 2012

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### Anonymous

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I want to know how to add inches
Ex. 2'.6" + 2'.7"+ 3'.3"= 8'.4"
I want the answer to appear as ( 8'.4") or
it is ok even if it appears as (8.333). I can always calculate .333 into inches

Posted on Mar 28, 2008

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support.casio.com/pdf/004/fx570MS_991MS_E.pdf

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### Floating point number into binary in fx-991MS

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### Casio fx 991ms

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.

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### How to calculate 0.3log(base 2)0.3 using fx-991ms calc

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_b(a)= (log_10(a) ) / (log_10 (b))
or the relation
log_b(a)= ln(a)/ln(b)

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

Jul 18, 2010 | Casio FX-115ES Scientific Calculator

### How do I calculate normal distribution using a fx-9750gII?

I don't know about fx-9750gII, but for fx-991MS
Change the mode to REG
Then

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### How to calculate ln using fx-991ms

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.

Nov 01, 2009 | Casio FX-300MS Calculator

### How to calculate calculus problem by a scientific calculator fx-991ms

Hello,
If by calculus problem you mean derivatives of functions, integrals, extrema and such things, I am sorry to inform you that neither the Casio FX-300MS, nor the FX-991MS can handle them. The newer Casio calculator FX-991ES is capable of performing numerical differentiations and integrations. There also graphing calculators by Casio FX-9750G, FX-9860G as well as by Texas Instruments (TI 83 PLUS/TI84PLUS) that are reasonably performant in that area.

Hope it helps.

Oct 19, 2009 | Casio FX-300MS Calculator

### How to calculate logrithm of base of any number in fx-991ms

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 loge and log10). To find a logarithm with base b, using any other base k: Oct 06, 2009 | Casio FX-300MS Calculator

### How to calculate logarithm values with different base

Like you maybe know in math (I know!) log x base y = log x / log y
so what you need its just input your number (x for example) and log it, than divide log x by log 2.
just: log x / log 2. (by the way in calculator the meaning of log x is log x base 10 the default base is 10)

Jun 05, 2009 | Casio FX-300MS Calculator

### Doubts

Nov 18, 2008 | Casio FX-300MS Calculator

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