Question about Casio FX-115ES Scientific Calculator

Press the S<=>D button located directly above the big red DEL button

Posted on Sep 03, 2008

17p-3bforp=8andb=11

Posted on Sep 06, 2008

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Posted on Jan 02, 2017

This calculator cannot do algebra so it does not handle polynomials. It does not have an EQN (equation) solving mode so you cannot enter an expression set = 0 and solve it for an unknown variable X.

It does have a table Mode where you can enter an expression y= F(X) and generate a table of values. If in the expression F(x) a numerical coefficient is a fraction just enter it as a fraction, possibly enclosed in parentheses. If it is a decimal number just enter it as a decimal number. Converting it to a fraction is not going to generate any more precision in the result. You lose precision when you go from fraction to decimal, but you do not make a number more precise by converting it from a decimal representation to a fraction.

It does have a table Mode where you can enter an expression y= F(X) and generate a table of values. If in the expression F(x) a numerical coefficient is a fraction just enter it as a fraction, possibly enclosed in parentheses. If it is a decimal number just enter it as a decimal number. Converting it to a fraction is not going to generate any more precision in the result. You lose precision when you go from fraction to decimal, but you do not make a number more precise by converting it from a decimal representation to a fraction.

Nov 16, 2013 | Casio fx-300ES Calculator

A number with a periodic decimal representation cannot be equivalent to a fraction with denominator 10 (or a multiple of 10) except if the repeating decimals are zeros.

0.454545...=45/99=5/11

0.454545...=45/99=5/11

Sep 04, 2013 | Super Tutor Pre Algebra (ESDPALG)

To change from fraction to decimal, all it takes is a keypress. (change key)

.Not all decimal results (approximations) will be converted to fractions.

Anyway, if you want to set the calculator to display decimal results only,

Press SETUP

Press 2:EDITOR

Select 1:LINE.

.Not all decimal results (approximations) will be converted to fractions.

Anyway, if you want to set the calculator to display decimal results only,

Press SETUP

Press 2:EDITOR

Select 1:LINE.

Jan 30, 2011 | Sharp ELW535 Calculator

To change from fraction to decimal, all it takes is a keypress. (change key)

.Not all decimal results (approximations) will be converted to fractions.

Anyway, if you want to set the calculator to display decimal results only,

Press SETUP

Press 2:EDITOR

Select 1:LINE.

.Not all decimal results (approximations) will be converted to fractions.

Anyway, if you want to set the calculator to display decimal results only,

Press SETUP

Press 2:EDITOR

Select 1:LINE.

Oct 20, 2010 | Sharp ELW535 Calculator

To convert a single result from fraction to decimal, press SD. To have all results come out in decimal, press SHIFT MODE 2 to select LineIO mode.

Sep 26, 2010 | Casio fx-300ES Calculator

Pressing the [S

Sep 10, 2010 | Casio fx-300ES Calculator

if you do not want to change your settings There are two ways to foecr calculator to display a result in a decimal format.

Press [SHIFT][MODE] to access (Setup) and select [2:LineIO].

Just in case you want to revert to the other IO mode (MthIO)

Press [Shift][MODE][1:MthIO]

- Before pressing the [=] sign to get the result press [SHIFT] key. thus [SHIFT][=] displays a result in decimal format.
- If a result is already displayed and it is not in decimal format (fraction or radical) press the [S<=>D] key to convert it to decimal.
- The [S<=>D] key toggles between formats (fraction/radical to decimal and from decimal to fraction or radical depending on the format used in calculation.)
- That does not mean that every decimal number can be converted to fractions/radical.

Press [SHIFT][MODE] to access (Setup) and select [2:LineIO].

Just in case you want to revert to the other IO mode (MthIO)

Press [Shift][MODE][1:MthIO]

Feb 15, 2010 | Casio FX-115ES Scientific Calculator

This is a partial solution for I do not have the TI89 titanium with me.

1. The easiest way is to insert the decimal mark (. dot or , comma) at the end of one of the elements of the fraction (numerator or denominator).

Ex: if you enter 1/2 the calculator displays the fraction 1/2, but if you enter 1./2 or 1/2. or 1./2. it displays 0.5

2. You can also configure the EXACT/APPROXIMATE mode option of the calculator ( Press Mode then scroll till you see exact/approximate) then choose AUTO, EXACT, or APPROXIMATE.

In the EXACT option the calculator will perform exact algebra ( Pi remains Pi not 3.14159... ).

In the APPROXIMATE option, calculations are performed numerically (everything is treated as a decimal number.)

In the AUTO option the calculator will try its best to keep the results as exact as possible :

x/6 + 1/2 yields x/6 + 1/2

x/6. + 1/2 becomes .166666..x +1/2

x/6. + 1./2 becomes .16666..x +0.5

My suggestion ( if you allow me) : Leave the calculator set on AUTO, and convert to decimals as needed by putting the decimal mark at the end of an integer.

I hope it helps.

1. The easiest way is to insert the decimal mark (. dot or , comma) at the end of one of the elements of the fraction (numerator or denominator).

Ex: if you enter 1/2 the calculator displays the fraction 1/2, but if you enter 1./2 or 1/2. or 1./2. it displays 0.5

2. You can also configure the EXACT/APPROXIMATE mode option of the calculator ( Press Mode then scroll till you see exact/approximate) then choose AUTO, EXACT, or APPROXIMATE.

In the EXACT option the calculator will perform exact algebra ( Pi remains Pi not 3.14159... ).

In the APPROXIMATE option, calculations are performed numerically (everything is treated as a decimal number.)

In the AUTO option the calculator will try its best to keep the results as exact as possible :

x/6 + 1/2 yields x/6 + 1/2

x/6. + 1/2 becomes .166666..x +1/2

x/6. + 1./2 becomes .16666..x +0.5

My suggestion ( if you allow me) : Leave the calculator set on AUTO, and convert to decimals as needed by putting the decimal mark at the end of an integer.

I hope it helps.

Jul 22, 2009 | Casio FX-115ES Scientific Calculator

Hello,

Sorry to disappoint you but you cannot do it due to the fact that the representation of irrational (SQRT(2), ..) and transcendental (e, pi, etc.) numbers on a calculator or even a computer is approximative : a number like sqrt(2) has an infinite number of decimal digits while the number of internal digits a calculator uses to store results is limited (10, 12, 15 or even 24).

Once an irrational or a transcendental number has been**evaluated numerically** it generally ceases to be exact.

If you want to manipulate algebraic expressions, you need a calculator that has a CAS (computer algebra system) operating system and a**symbolic algebra **option.

Some exemples of calculators with a CAS are The TI nspire CAS, the HP 48 series, HP 49, HP 50, Casio ClassPad3xx, the TI 89titatium, the TI Voyager 200PLT, the TI 92 and Ti 92Plus. The ones with a fullblown keyboard might not be accepted on certain standardized test.

You may also try to get some emulators on the Internet for the HPs or the TI 8xx and play with them on the computer.

Hope that helps.

Sorry to disappoint you but you cannot do it due to the fact that the representation of irrational (SQRT(2), ..) and transcendental (e, pi, etc.) numbers on a calculator or even a computer is approximative : a number like sqrt(2) has an infinite number of decimal digits while the number of internal digits a calculator uses to store results is limited (10, 12, 15 or even 24).

Once an irrational or a transcendental number has been

If you want to manipulate algebraic expressions, you need a calculator that has a CAS (computer algebra system) operating system and a

Some exemples of calculators with a CAS are The TI nspire CAS, the HP 48 series, HP 49, HP 50, Casio ClassPad3xx, the TI 89titatium, the TI Voyager 200PLT, the TI 92 and Ti 92Plus. The ones with a fullblown keyboard might not be accepted on certain standardized test.

You may also try to get some emulators on the Internet for the HPs or the TI 8xx and play with them on the computer.

Hope that helps.

Jul 05, 2009 | Casio FX-115ES Scientific Calculator

Hello,

When you calculate the** product** 7.4 x2, the calculator gives you a fraction reduced to it simplest terms, 74/5 . The result is correct, but it happens that you want it
expressed as a decimal rather than a fraction. To fix that all you have
to do is to press the button **[S<->D] ** above the red [DEL] key. It allows you to toggle the display format between fraction and decimal.

74/5 [S<->D] changes display to 14.8 and if you press the key again you go back to fraction

14.8 [S<->D] 74/5

Similarly, if you enter square root of 2 and it displays as a radical, you convert it to a decimal by pressing the key [S<->D].

The fraction and radical formats allow you to do exact claculations. But if you do not want to hear about that you can just press [SHIFT][MODE][2:LineIO] : Your calculator will do things the old way, but you will lose some important functionalities.

My suggestion is to set the default mode [MathIO] by pressing [SHIFT][MODE][MathIO] and to press the [S<->D] key to convert to decimal.

Hope it helps.

When you calculate the

74/5 [S<->D] changes display to 14.8 and if you press the key again you go back to fraction

14.8 [S<->D] 74/5

Similarly, if you enter square root of 2 and it displays as a radical, you convert it to a decimal by pressing the key [S<->D].

The fraction and radical formats allow you to do exact claculations. But if you do not want to hear about that you can just press [SHIFT][MODE][2:LineIO] : Your calculator will do things the old way, but you will lose some important functionalities.

My suggestion is to set the default mode [MathIO] by pressing [SHIFT][MODE][MathIO] and to press the [S<->D] key to convert to decimal.

Hope it helps.

Jun 25, 2009 | Casio fx-300ES Calculator

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