Question about Casio FX-250HC Calculator

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Hello, is there a way to fix my Casio fx-250HC fraction calculator? It was working fine, until recently that when I turn it on there is a 1 on the far left of the screen that cannot be removed plus I can not even make the simplest calculations for example, 1+1? Is this fixable? If so, how? -Thanks

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Posted on Jan 02, 2017

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SOURCE: Hi, I have a Casio calculator fx-991MS giving me wrong answers!

I am only looking for a plausible cause of the error, because I do not believe your calculator can make such a mistake. I think you accidentally activated the Exponential display format and did not pay attention to the small, raised -03 that came at the end of the number displayed. It is a common mistake for those not very familiar with Scientific or exponential notation.

Let us try to reset your calculator to the normal (floating point) format.
Press the [MODE] key a number of times until you reach a screen that has FIX, SCI, NORM and under each one a number (FIX 1, SCI 2), Norm 3). To have the number of decimal place you gave in your result (4 decimal digits), you press 1 to select Fix then 4.

Be aware that scientific calculators usually stop displaying results in floating point format ( 0.0000045 ) if the number is smaller then 0.001. So basically, 0.00099 will be displayed as 9.90-04, -04 being raised above the level, and in smaller size.

Hope it helps.

Posted on Oct 02, 2009

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SOURCE: How can I solve a fraction like 1/2 plus 9/3 on a

Use the [a b/c] key to separate the elements of a fraction.
To enter 1/2 : press 1, press [a b/c], then press 2

1/2+ 9/3 : 1[a b/c]2 + 9[a b/c] 3 [=]
By the way, why do you keep 9/3 as a fraction when you can have it as an integer? Not that it makes a difference to the calculator.

Posted on Jul 25, 2010

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SOURCE: Hello How to solve complex

The simultaneous equation solver requires the coefficients to be real. Similarly matrices must have real coefficients.
Your only alternative is to express each of A and B as a real part and imaginary part.
A= x1+iy1
Substitute x1+iy1 for A in the two equations. Substitute x2+iy2 for B in the two equations. Do the algebra. Gather real parts and gather imaginary parts. Split each original equation into two equations: One equation comes from setting Real Part of left side = real part of right side (1); the other equations comes from setting the imaginary part of left side= imaginary part of right side (here 0).

Do the same procedure for the 2nd original equation.
At the end of the process you will have 4 coupled linear equations in the 4 unknowns (x1,y1,x2,y2).

Then you might want to use the calculator to solve the derived system. Once you have x1,y1,x2,y2 you reconstruct A=x1+iy1, etc.

Posted on Aug 29, 2011

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SOURCE: my casio fx82 au plus calculator is answering me

Loook for a key marked F<>D and press it to toggle between fraction and decimal displays.

Posted on Feb 03, 2012

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Fx-250-hc entering fractions

Look for a key marked as [a b/c]
To use it to enter an (improper) fraction type in the numerator , press the [a b/c] key the type in the denominator thaen press [=].
To enter a mixed number
type in the integer press [a b/c] thype in the numerator, press [a b/c] then type in the denominator followed by the =/EXE key. the result will be displayed as [integer number] [r] [numerator] [r] [denominator].
The separator [r] may look that the letter r or the letter u.

Jan 21, 2012 | Casio FX-250HC Calculator

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I need a casio manual for an fx-250HC calculator. Where can I find one?

You can download the manual from the manufacturer's web site at

Jul 09, 2011 | Casio FX-250HC Calculator

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How do i get my casio fx-115 ES to let me use sec csc cot

The calculator doesn't have those functions built-in. Use the relationships sec(x) = 1/cos(x), csc(x) = 1/sin(x), and cot(x) = 1/tan(x).

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Cant get answers in decimal format, I would like to set up my casio fx83es so that the answer is in decimal format all the time.

To make sure that results are always in decimal format, put a decimal mark (point) at the end of one integer.
ex: 1./2 or 1/2. or 1./2. display as 0.5, so does 1. + 1/2
To convert from decimal to fraction and from fraction to decimal press a b/c
To convert from proper to improper fractions use [SHIFT][d/c]
Hope it helps.

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Problems with fractions on the Casio fx-115es

To convert fractions to decimals or decimals to fractions, you use the [S<->D] key. Each time you press the key the result is displayed in the other format.
Alternatively, If you multiply or divide two integer numbers put a decimal mark at the end of one of the numbers (any one). The result will be displayed in decimal format.

Hope it helps.

Jun 01, 2009 | Casio FX-115ES Scientific Calculator

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Substitute for 1/X key

Use the x^-1 key, second row, far left. 1/x is x to the -1 power.

Feb 06, 2009 | Casio FX-250HC Calculator

1 Answer

Casio fx-250HC

press "0"(zero) then Min (memory in). This will clear the memory- do it that way with my 250hc all the time.

Oct 17, 2008 | Casio FX-250HC Calculator

1 Answer

How to reset

pull bateries out and wait 5 minutes reinstall new batteries

Jun 30, 2008 | Casio FX-250HC Calculator

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