Question about Casio FX-300MS Calculator

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When i enter 10 exp (-)2 equals, the calculator displays the result as 0.1 when it should be 0.01? why would this be happening?

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The [EE] or [Exp] shortcut is the source of much grief to the students.
When you press the [Exp] 0 you are in fact entering 1.00 so

[EE] (-)1 [=] gives 0.1
[EE] (-)2 [=] gives 0.01

10[EE](-)2 is 10[x][EE](-)2 or 10[x]0.01 = 0.1

The new generation of calculators does not have the [Exp] or [EE] key. It is replaced by a key with a more explicit label [times 10 to the X]
Hope it helps.

Posted on Sep 25, 2009


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Dividing 2 different scientic equations into another

Sorry but you are using the word EQUATION incorrectly. All you have is two numbers you want to divide one by the other.
Enter the numerator 1EE (-) 14, press the division key / then enter the 5 EE (-) 12. Press the = sign.
Note: to enter the negative sign in the exponents, use the change sign key marked (-), (+/-) or [+/-] . Do not use the regular MINUS sign.
When you use the EE key, you must not enter the 10. It is understood because EE is a shortcut for *10^.

Apr 06, 2014 | Texas Instruments TI-30XA Calculator

1 Answer

I need step by step instructions on using Casio fx-115ES ee or exp burron.

The equivalent of the EE or EXP button on the Casio Fx-115ES is marked as x10^X. It is located at the bottom right of the key pad left of the = key.
To enter the power of 10 in a number written in scientific notation, you press the x10^X button followed by the exponent. If the exponent is negative you press the change sign key first [(-)] , then the one or 2 digits in the exponent.
Example Enter the mass of the proton m_p in kilograms
1.6726217 [x10^X] [(-)]27 [=]
In grams the value above is multiplied by 1000.
1.6726217 [x10^X] [(-)]24 [=]

Since the calculator has the physical constants (the FX-991ES definititely has them)
  1. Display the proton mass in kilograms
  2. [SHIFT ][7] to open the constants catalog,
  3. type 01 for the proton mass, then press the [x^-1].
  4. Divide the result by 1000
  5. You should get 5.978638635 x10^23

Feb 07, 2012 | Casio FX-115ES Scientific Calculator

1 Answer

If I type in "10 EXP 5 =" it says it equals 10^6

You are making a common error.The EXP key is a short for 10^
Thus when you enter 10 [EXP] 5 you are in fact entering 10*10^5 which is 10^6. When you use the EXP key , the 10 should never appear, it is already implied.

Oct 04, 2011 | DateXX DS638 Calculator

1 Answer

Hi. my calculator canon f 604 is acting wierd. when i press 10 EXP 2 , it gives me 1000 instead of 100. please help me out there is a problem in my calculator. for each exponent it gives one extra like...

You're getting the correct results. The "EXP" means "times ten to the". When you press 10 EXP 2, you're asking for 10 times ten to the second, which is 10 times 100 or 1000. If you just want ten to the second, press 1 EXP 2.

Apr 23, 2011 | Canon F604 Scientific Calculator

1 Answer

Negative log

Use the log function (common logarithm). See screen capture for markings on key.
To evaluate the negative of a logarithm
Enter the number (argument) of the logarithm
Press the = key to have it calculated.
While result is still displayed, press the sign change key or (+/-).

Beware that -log(number) is not necessarily a negative value.

Another way to calculate -log is to use the relation
log(1/a)=-log(a) .

Your example

3 [EXP] [(] [+/-] 2 [) ] [LOG][=] [+/-]

[EXP] is the key to enter exponent of a power of 10 :It is a shortcut, so no 10 is entered. Respect the key sequence above.
[ (] left parenthesis to prevent ambiguity due to the negaticve exponent. Just a security.
[)] is the enclosing right parenthesis
[+/-] is the Sign Change key

May 06, 2010 | Casio FX-260 Calculator

2 Answers

Step by step ho to Convert Fractions to decimals?

No post is an adequate substitute for reading the manual. Here is the meaning of some of the primary keys.
  1. hyp.: To calculate hyperbolic functions: hyp + sin calculates the hyperbolic sine, hyp + cos calculates the hyperbolic cosine, hyp + tan calculates the hyperbolic tangent (sinh, cosh, tanh)
  2. sin. To calculate the sine of an angle
  3. cos.To calculate the cosine of an angle
  4. tan. To calculate the tangent of an angle
  5. yx : y with raised x, calculates general powers
  6. ln: calculates the natural logarithm (log in base e)
  7. log: calculates the logarithm in base 10
  8. ab/c : used to enter mixed fractions; 13 ab/c 7 ab/c 5 enter the mixed fraction 13 and 7/5
  9. x10 to the X : calculates the exponential function on some calculators. used to enter powers of 10 as in scientific notation; 6.02x10^23 is keyed in as 6.02 EXP 23 (Avogadro's Number of Chemistry and Physics)
  10. (-).: This is the change sign. It negates the value of a number. If a result is positive it makes it negative, and if it is negative it makes positive
  11. deg ' " : used to convert between decimal degrees and degree, minute, second.
  12. rcl : used In conjunction with a memory location, recalls the contents of the memory ( if there is one memory M, extracts what is in M and displays it)
  13. sto: used in conjunction with the name of a memory register, stores a result or an entry in the relevant memory.
  14. M+ adds the content of the display to the constant memory M

Jan 13, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

Guys i need to get an inverse log the same as log-1 ou know how?


When you talk about the natural logarithms [LN], the inverse of the log is the exponential

ln (exp(x))=exp(ln(x)) =x
but with othe logarithms, thinhs are different
Let us take


then with log standing as usual for log in base 10 take the log of both members in the above equality

log(y) =log{10^(x)) = x* log(10) : this is a property of the log function.
However, log(10) =1 This is also a property of the log

Gathering results, we end up with the new equality
log(y)=x or x=log(y)

Without entering into extraneous details that mathematicians adore, we can state that there is an equivalenve between y=10^(x) and x=log(y)

y=10^(x) <-->x=log(y) where <--> means implication in both directions.

Here is a screen capture from another calculator to convinve you. Your calculator cannot do that.


Hope it helps.

Oct 06, 2009 | Texas Instruments TI-30 XIIS Calculator

1 Answer

How do I proform the -log of a number ie -log(1.2 X 10-5) to find the pH

The pH is defined as the negative log in base 10 of the H+ (H3O+) ion concentration. The concentration of your solution is 1.2x10^(-5). You calculate the log of 1.2x10^(-5) which is -4.9208188754, let us just say it is equal to -4.921.
Once result is displayed press the change sign key (-) or on some calculators [+/-] and calculator will take the negative of the result.
So your pH is about 4.921

Another less efficient way to do it is to enter
0-log(1.2x10^-5) [ENTER]. The result will be positive.

The change sign (-) is smaller than the regular MINUS sign. It is used with negative exponents and to change the sign (hence its name) of a displayed result.

Oct 06, 2009 | Texas Instruments TI-30XA Calculator

1 Answer

Is there a way to fix the casio fx 260 solar to display numbers in scientific notation Like 3 x 10(raised to the 2nd power)?

This can be done by setting the calculator to the right MODE. Press MODE 9 to turn on scientific notation. For example, compute 1 / 200 = and you will see 5 with a -03 exponent in the upper right. Press MODE 9 again and it will be displayed .005

To enter numbers in scientific notation use the EXP at the bottom. To enter .005, press 5 then EXP then +/- then 3. You will see it displayed. Then you can perform calculations with this entered number.

Oct 01, 2009 | Casio FX-260 Calculator

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