Question about Casio FX-115ES Scientific Calculator

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What is RCL ? - Casio FX-115ES Scientific Calculator

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If it shows up on the display, it means the calculator is standing by for input of a variable name to recall the variable's value. If you mean the key, that's the key used to recall a variable from memory.

Posted on Nov 06, 2010

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Problem with adding values by highlighting previous solutions


Have you considered to store your important results for future use. To store a result needed for future calculations press the STO> button then ALPHA then the letter where you want to store the number.
Example: 111 STO> SHIFT A ENTER
222 STO> ALPHA B ENTER
333 STO> ALPHA C ENTER

To add them use the RCL key
SHIFT RCL ALPHA A +SHIFT RCL ALPHA B+SHIFT RCL ALPHA C ENTER

Dec 12, 2012 | Texas Instruments TI-84 Plus Calculator

1 Answer

How do I get 25.4 into Memory. I cannot find memory storage, but I know it's gotta be there?


Press
2 5 . 4 STO 1
or
2 5 . 4 STO 2
or
2 5 . 4 STO 3
depending on which storage register you want to put the value into. You can recall the value by pressing RCL 1 or RCL 2 or RCL 3 as appropriate.

Aug 03, 2011 | Texas Instruments TI-30XA Calculator

1 Answer

How do I use my casio to determine the area of a trapizoied?


There is no special setup. You just have to have the formula in front of your eyes and type in the numbers as you would by hand.
The area of a trapezoid is given by
Area= (measure of Longer base PLUS measure of shorter base) * (measure of height) /2
If A is the measure of the longer base, B the measure of the shorter base, C the measure of the Height --ALL EXPRESSED IN SAME UNIT--you can type in the formula (in MathIO display mode) as
0.5 [*] [ ( ] A [+] B [ ) ][ / ] C [=]

You can also store the values in memory. To store a value, enter the value then press [SHIFT][RCL] and the key that has the letter next to it. For A it is the change sign key [(-)]
Ex:
15 [SHIFT][RCL] A
10 [SHIFT][RCL] B,
7 [SHIFT][RCL] C

To calculate, you have to recall the values stored in the variables by pressing [RCL] A, [RCL] B, [RCL] C and use the key sequence
0.5 [*] [ ( ] [RCL] A [PLUS ] [RCL] B [ ) ][ / ] [RCL] C [=]
Do not forget the parentheses to enforce the priority rule for operations.

If you are in MathIO, you will be able to verify the correctness of the formula before you press the [=] key to evaluate it.

Feb 21, 2011 | Casio FX83ES Scientific Calculator

1 Answer

How do I enter (simple step-by-step please) the quadratic equation into this model of calculator?? Thanks.


The TI-30XA does not offer any symbolic algebra or equation solving functions. You will need to do some work on paper. However, its not super difficult.

Solving quadratic equations (finding the roots) involve three steps:
  1. Simplify the equation and bring into the normalized form x² + px + q = 0.
  2. Determine the discriminant D = p² - 4q and check if there are two, one or no solutions at all.
  3. Calculate the root(s), if any.
Lets do (1) with an example, 3x - 2 = ( 6 + x ) / x.
mib8888_37.gif

You should exercise this simplification with different examples until you can do it in your sleep. The goal is to get a form x² + px + q = 0, where in the above example case, p = -1 and q = -2.

Now, use the memory places #0 and #1 to store p and q, as in:

-1 [STO] 0
-2 [STO] 1

Next, you should determine the discriminant D = p² - 4q of the equation using your TI-30XA calculator. Having put the two values into the memory comes in handy here:

[RCL] 0 [x²] [-] 4 [x] [RCL] 1 [=] [STO] 2

Note, we put D into memory place #2, we will need it again later.

Now check the displayed value D:
  • if D
  • if D = 0, there is exactly one solution: -p / 2. Key in [RCL] 0 [+=-] [÷] 2 [=] and the displayed value is the only solution to the quadratic equation.
  • if D > 0, there are exactly two solutions:
    mib8888_39.gif
    Key in [RCL] 0 [+=-] [+] [RCL] 2 [mib8888_40.gif] [=] [÷] 2 [=] to get the first root, and
    [RCL] 0 [+=-] [-] [RCL] 2 [mib8888_41.gif] [=] [÷] 2 [=] for the second root.
In the example, the discriminant turns out to be 9, which is greater than 0, so there are two different roots. Following the key sequences you should get the roots x1 = -1 and x2 = +2. You can double check by calculating
mib8888_42.gif
and you'll receive the original, normalized equation.

As an exercise for your understanding: you can save a few keystrokes by saving -p to memory #0 instead of p. Try to figure out why this helps.

Feb 11, 2011 | Texas Instruments TI-30XA Calculator

1 Answer

Sto with shift and rcl key functions


The memory locations are A,B,C,D, X, Y, M. Their markings (on the body of the calculator) are of the same color as the [ALPHA] key. The markings are on the right of the key

To store a number (13.5654) in memory A,
13.5654 [STO] (A) [=]
To recall the contents of memory A
RCL (A)

May 01, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

Change the time 2005 saturn ion


1. Press and hold RCL button
2. While holding RCL button push left side of AUTO/TONE rocker button until correct hour appears
3. While holding RCL button push right side of AUTO/TONE rocker button until correct minute appears
4. Release RCL button when finished

Or if you have an "RDS" (Radio Data System) you can find a radio station which transmits some kind of text (ie the call letters or song name) you can hold the 'RCL' (timeset) button and push the RDS button. It will attempt to read the time from the data stream and set the clock for you. Otherwise it will say something like 'No RDS time set'. you need to tune a station with RDS - it won't scan them for you.

Nov 04, 2009 | 2005 Saturn ION

1 Answer

How do I use the memory function for my fx-115 es calculator


Hello,
You have 7 memory registers, namely A, B,C, D, X, and Y.
To store a value in say register A you press [SHIFT][RCL] (STO) A. The (STO) is the function you acces when you press [SHIFT][RCL].

Thus
23 [SHIFT][RCL] A displays 23 -->A and the value is shown on the bottom of the screen.

To recall a value from register A, you press [RCL] A.
Hope it helps.

Nov 04, 2009 | Casio FX-115ES Scientific Calculator

1 Answer

Rcl button


It's Recall, the opposite of Store. It's also a little redundant, in my opinion.

Enter Rcl, followed by the name of a variable, and the value of the variable is placed on the display. You can get the exact same result by simply using the name of the variable.

Sep 04, 2008 | Texas Instruments TI-84 Plus Calculator

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