20 Most Recent Casio fx-300ES Calculator Questions & Answers


CASIO fx-82MS: How can I erase

Hey I had the Similar Problem, which got solved as I happened to refer to the Quick Reference specified inside the Calculator cover (FX-82 ES). Press the SHIFT and CLR buttons for a while and then select 2(Mode) and then press the ' = ' button. The ENG sign disappears!!! Well Hope it works for you and others too :)
9/18/2021 1:40:46 PM • Casio fx-300ES... • Answered on Sep 18, 2021

On a casio calculator how

You can store values in the memory locations A,B,C,D,X and Y. To access these variables, you must precede the key by pressing [ALPHA]. Thus to access Memory variable A press [ALPHA][(-)].

To store a number in memory A Press [SHIFT][RCL] (STO) . When you use the shifted key to store no need to press [ALPHA].
To recall the contents of memory A, just press [RCL] followed by [(-)]. No need to press [ALPHA]
Say you want to calculate 3 5 and assign value to memory A
3 5 [SHIFT][RCL] [(-)] A.
Similar sequences for B,C,D, X, and Y.

I am not sure about the Casio FX300ES but the FX-991ES does have a solver mode. On that calculator, to enter the = sign in an algebraic equation use the [ALPHA] key followed by a key on the top left of keypad ( Could be CALC).

I suggest you refer to the manual for the calculator for examples of use for the memory keys. Look in the separate Appendix too.
6/27/2021 9:48:37 AM • Casio fx-300ES... • Answered on Jun 27, 2021

How do i get my calculator back to math format

Press [SHIFT[[ MODE] to enter (SetUp), then select [1:MathIO]
3/27/2019 8:37:50 AM • Casio fx-300ES... • Answered on Mar 27, 2019

How do I get my casio fx300es plus to give me square root answers instead of decimal?

To calculate the square root use the square root key, three rows above the "8" key.If you want to see the result symbolically, press SHIFT MODE 1 to select the MthIO mode. Bear in mind that the calculator can only show some results symbolically.
12/22/2018 5:53:05 AM • Casio fx-300ES... • Answered on Dec 22, 2018


To configure the calculator to do fractions, set the Input/Output mode to MathIO.Press [SHIFT][MODE] to open (SetUp) then select [1:MathIO]. After you set it to MathIO, pressing the fraction key will display a fraction template where you can enter numerator and denominator as you would by hand (horizontal fraction bar). Also, the calculator will display results as fractions and radicals whenever possible.To perform arithmetic operations on fractions use the regular operation keys (x, +, -, /). The calculator will perform the operations and display the results as fractions (whenever possible).
9/27/2018 2:02:12 AM • Casio fx-300ES... • Answered on Sep 27, 2018

How do I get decimal answers

I had the same problem. To change the output to decimals, do the following:
Go to Math mode, then SHIFT, MODE (set-up), 2 (lineIO). This will cause answers to show in decimal format. I hope this helps.

I was able to find a manual at: http://www.generalmanual.com/Calculators/Casio-FX-300ES-Scientific-Financial-Calculator.htm
5/16/2018 10:14:52 AM • Casio fx-300ES... • Answered on May 16, 2018

Casio fx-300ES Calculator inputting fractions

The little L is the way to separate the numerator from the denominator. That is the old way of writing fractions. If you want the stacked representation, switch the display mode to MathIO. Press Shift Mode to get to Settings, then enter the number corresponding to MathIO. image 1-yhkzduexv1cd5epohfawnpe0-4-0.jpg
5/1/2018 8:12:34 AM • Casio fx-300ES... • Answered on May 01, 2018

Screen glitch

Get another calculator.
4/8/2018 9:38:47 PM • Casio fx-300ES... • Answered on Apr 08, 2018

How to get it out of Sci math

To get out of the default MthIO press [SHIFT][MODE][2:LineIO]
To get out of Sci display format, press [SHIFT][MODE][6:Fix] followed by a number between 0 and 9, that will set the number of decimal digits.

Hope it helps.
Thank you for rating this solution.
10/9/2016 5:28:14 PM • Casio fx-300ES... • Answered on Oct 09, 2016

How to factor a polynomial equation on casio fx-300es?

The Casio FX-300ES does not handle symbolic algebra. So it cannot factor a general polynomial expression. The methods can be found in any book on Algebra.
However if you are interested in approximate factorization of quadratic and cubic polynomials, you can use the calculator to do that. It can solve aX^3 +bX^2+cX+d =0 and the quadratic equations.

If you want to factor a cubic polynomial P3(X) = aX^3+bX^2+cX+d , you write the corresponding cubic equation as aX^3+bX^2+cX=d =0 , then you divide all terms of the equation by a to obtain


You use the calculator to solve (approximately) this equation.
Suppose you find the 3 roots X1,X2,and X3. Then the polynomial X^3+(b/a)X^2+(c/a)X+(d/a) can be cast in the factored form (X-X1)(X-X2)(X-X3) and the original polynomial P3(X) can be written as

P3(X) = a*(X-X1)(X-X2)(X-X3)

You can handle the quadratic polynomial the same way.

P2(X) =a*(X-X1)(X-X2) where X1, X2 are the two real roots

Hope it helps.
8/28/2016 7:22:49 PM • Casio fx-300ES... • Answered on Aug 28, 2016

How to remove this figure 0.000000x10 in my casio

Set up mode
6/15/2016 2:01:55 AM • Casio fx-300ES... • Answered on Jun 15, 2016

How can I change pi value to 3.14 on calculator?

I don't think you can change the pi value on your calculator. However, what you can do is store 3.14 in the memory and instead of using the pi key, recall the number from the memory key. How to use the various memory keys is outlined in the manual. Good luck, Paul http://support.casio.com/storage/en/manual/pdf/EN/004/fx-300ES_PLUS_EN.pdf
4/8/2016 11:24:00 PM • Casio fx-300ES... • Answered on Apr 08, 2016


You could always remove the battery and start over. The procedure for removing the battery is on page 29 in the attached manual. Good luck, Paul http://support.casio.com/storage/en/manual/pdf/EN/004/fx-300ES_PLUS_EN.pdf
3/8/2016 6:22:24 PM • Casio fx-300ES... • Answered on Mar 08, 2016

How to put geometric sequence in this calculator?

Are you trying to find a particular term in the geometric sequence? For example, in the geometric sequence 2,4,8,16 to find the 15th term we would use the formula a sub n = a sub 1 x r ^(n-1), where a sub n is the nth term of the geometric sequence a sub 1 is the 1st term of the geometric sequence r is common ratio between successive terms n is the term you are looking for In our example, a sub 1 is 2, r is 2 and n is 15. a sub n = a sub 1 x r ^(n-1) a sub 15 = 2x 2(15-1) a sub 15 = 2 ^ 15 a sub 15 = 32,768 On your calculator, you use the key to the right of x^2 to do x to the nth power. Good luck. Paul Geometric Sequences and Series casio fx 300es manual Google Search
1/14/2016 3:46:35 PM • Casio fx-300ES... • Answered on Jan 14, 2016

I have to multiply by

To insert pi on this calculator press [shift] [x10x] . (you can see the pi symbol above and to the side of this button).
12/21/2014 9:58:36 AM • Casio fx-300ES... • Answered on Dec 21, 2014

How to make all answers appears as decimals

Set the Input/Output display mode to LineIO. Press Mode then select 2: LineIO
12/5/2014 4:52:19 PM • Casio fx-300ES... • Answered on Dec 05, 2014

How to change from 5 decimal places

Change from 5 decimal places to what?
10/2/2014 7:43:48 PM • Casio fx-300ES... • Answered on Oct 02, 2014

Casio fx-300 ES how do I use the significant figures

That is not something that can be done by calculator. Do all the operations to get a result. Look at the number of significant figures in each number in the chain of operations. Keep the least number of significant figures. The result of a calculation cannot be more precise than the least precise of its components.
9/2/2014 3:04:26 AM • Casio fx-300ES... • Answered on Sep 02, 2014

How am i supposed to solve a quadratic equation ?

Use the quadratic formula, or factor the quadratic polynomial. Once factored into a product of two first degree binomials, the roots are obtained by setting (in TURN) each binomial factor equal to zero.
8/27/2014 3:25:37 PM • Casio fx-300ES... • Answered on Aug 27, 2014
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