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Where is the log button

Cant find instruction book where is the log button

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Posted on Feb 03, 2009

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I cant find my Antilog button on my Casio fx-100MS


The common antilog is the shifted function of the "log" button (marked 10-superscript-x) and the natural antilog is the shifted function of the "ln" button (marked e-superscript-x). The log and ln buttons are both on the third row of the keyboard.

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My husband is looking for a book on Trigonometry and Logarithms. He says it should have lists of numbers. He is an Engineer. Is there such a book?


He needs a math tables book. They may not be published anymore, but try an old book store. Also search online for "math tables". This site has some tables http://math2.org/,

May 21, 2011 | Calculators

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When I go to use the 'log' button on TI 30XA I do not come up with the same answer as in my course book (for the examples) No real instructions on logs in the little instruction book. Have tried...


You calculate the pH with the relation
pH=-log(c) where c is the value of concentration in mol/L.
ex: c[H+]= 3.57x10^(-6)
pH: (-) [LOG] 3.57 [2nd][EE] [(-)] 6 [ ) ]
Here you have 2 change sign key press [(-)]

If you have the pH, and want to calculate the concentration that yields that value of the pH you proceed as follows
c= 10^(-pH)
Ex pH=8.23
c: [2nd][LOG] [(-) 8.23 [)]

General shortcut.
If concentration is of the form c[H+]= 1*10^(-a) where a is an integer between 0 and 14, the pH is equal to the positive value of exponent.

Ex:c[H+]=1x10^(-5) Mol/L then the pH is just the positive value of the exponent, ie 5 because pH=-log(1.x10^-5) =- log1 -log(10^-5)=0 -(-5)=5
Above I use the rule log(axb)=log(a)+log(b) , the rule log(a^b) = b*log(a)and the facts that log(1)=0 and log(10)=1, the last being true if log stands for log in base 10.

May 17, 2011 | Texas Instruments TI-30XA Calculator

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I cannot figure out how to get the log key to look like this..log^-1. In my text book it said something about the ln button. That didn't work. Please help.


The logarithmic functions have inverse functions that happen to have specific names. Even if the log^-1 notation may found on textbooks you will not find it on claculators.

Natural Logarithms LN. The inverse function of the natural logarithm is the EXPONENTIAL noted e to the x or e^x. On calculators the two functions usually share the same physical key. For example, LN is accessed directly and e^x is accessed with

Jun 13, 2010 | Texas Instruments TI-83 Plus Calculator

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How to enter logarithms in to a ti-83 plus. I know where the log button is but i cant figure out how to put in the base of the log or anything after that. Trying to graph a log.


The TI-83+ has keys for natural and common logarithms (base e and 10, LN and LOG, respectively). If you want to calculate the logarithm to another base, you have to use the relationship

LOGb(x) = LOG(x)/LOG(b) = LN(x)/LN(b)

Apr 10, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

Can't chang the logbase


It's 2*3=6 but about the base, you can't change it in the calculators the default base it's 10 so log x it's Logbase 10^x here some logs:

log x base y = log x / log y
log (x*y) = log x + log y
log (x/y) = log x - log y
in your example log 9 base 3 = log 9 / log 3 etc.
hope you get it, and it was helpful

Nov 12, 2008 | Texas Instruments TI-89 Calculator

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Try 1/x button, does that give you the correct answer ? guessing the inverse ?

Jun 01, 2008 | Casio FX-300MS Calculator

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Setting tax


try switching the top button next to GT to rate,then enter your tax rate then % (8.25%) then switch the top button back to on (or whereever you had it set to) and hit the tax+ button. That worked for me. GO TEXAS!!!

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Casio Classpad 300 plus


I bought a classpad 300 plus but I dont know how to operate it. I saw some books for classpad 300 and I really want to buy some. However everytime I try to buy, there is always a classpad that goes with the books . Can I buy books for classpad with out buying a calculator anymore?

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