Question about Casio FX-250HC Calculator

# 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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## 5 Suggested Answers

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Posted on Jan 02, 2017

Hello,
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

Testimonial: "Thanks so much, its working now:) I thought I was going to have to buy a new calculator!"

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

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
B=x2+iy2.
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

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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## Related Questions:

### 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

### 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
http://support.casio.com/pdf/004/fx82SX_E.pdf

Jul 09, 2011 | Casio FX-250HC Calculator

### 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.

Hello,
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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Hello,
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.

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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

### 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

### How to reset

pull bateries out and wait 5 minutes reinstall new batteries

Jun 30, 2008 | Casio FX-250HC Calculator

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