Question about Casio FX83ES Scientific Calculator

# My calculator won't give me the correct average.

If i put in 1.94+2.35+4.38 (divide symbol)3 it gives me 0.9633333' or 5.97 or some other random thing. Tres annoying.

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You need to use parentheses to group the additions together since division has precedence over subtraction. If you enter 1.94+2.35+4.38/3 then calculator takes that to mean 1.94+2.35+(4.38/3). You need to enter it as (1.94+2.35+4.38)/3.

Posted on Oct 20, 2013

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Posted on Jan 02, 2017

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.

Posted on Sep 12, 2009

Hello,
Use the [S<->D] key to switch between the two.
Hope it helps.

Posted on Sep 24, 2009

Hello,
If a number is displayed as a fraction or a radical (square root or other roots) you change it into a decimal number by pressing the [S<=>D] key, just above the red [DEL] key.
If you do not care for fractions or radicals, you configure your calculator to display only decimals. To do that you press [SHIFT][MODE][2:LineIO].
Warning: If you do that you will not be able to enter fractions or radicals in the natural (textbook display)
Another way to display a fraction or a radical as a decimal is to press [SHIFT][=] to get the result not the [=] alone.

Hope it helps.

Posted on Nov 14, 2009

1. If a fraction (or a radical) is already displayed press the [S<=>D] key to convert it into a decimal number.
2. If you are entering an expression and want its result displayed as a decimal number, press the [SHIFT][=] key sequence instead of just [=].
3. More permanent solution: If you do not want fractions nor radicals, configure the Input/Output to be LineIO. To do that, press [SHIFT][MODE] to access the (SETUP) then select the option [2:LineIO]

Posted on Jun 01, 2010

Try using the S<>D(above the orange DEL button) button after you've obtained your result..

Posted on Aug 22, 2010

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## Related Questions:

### What does average in math

A calculated "central" value of a set of numbers.

To calculate: add up all the numbers, then divide by how many numbers there are.

Example: what is the average of 2, 7 and 9?
Add the numbers: 2 + 7 + 9 = 18
Divide by how many numbers (i.e. we added 3 numbers): 18 Ă· 3 = 6
So the average is 6

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### How to calculate percentage

To calculate the percentage you divide 954 by 1000. This gives you 0.954 which you multiply by 100. To the result you get you append the symbol %

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### How to calculate mode with caso fx-991ES

MOD simply calculates the remainder that is left over after dividing by the MOD parameter.
For example, 10MOD7 = 3 since you can only divide 7 into 10 once, leaving a remainder of 3.
For larger numbers, eg 389487MOD31 you start by dividing 389487 by 31, which gives 12564.09677 (on the display), however you only want the fractional part so subtract 12564 to give 0.0967741935 . This includes the lower value digits that were previously hidden. Then multiply this result by 31 which gives 2.999999999 on the display. Since the result of a MOD calculation has to be a whole number, the answer needs to be rounded to 3. If the answer doesn't easily round to a whole number, it is likely that you have gone beyond the calculators working capacity.
An alternative method is to take the integer part of the first result (12564) and multiply it by 31 to get 389484, then subtract this from 389487, giving the answer of 3.

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### My ti-83 plus is giving me the wrong answer only when i divide.

I am sorry, there is nothing to fix. The answer is perfectly correct. 62250/1450=439310344828
I think you meant to divide 65250 by 1450, the result of which is 45.

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### My calc won't divide anymore just gives me fractions. what did i do?

To change a result from Fraction/radical to a decimal approximation, press the key marked S<>D. To completely prevent the display of fractions, change Input/output configuration.
Press SHIFT MODE to enter SetUp. Select LineIO

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### My hp50 calculator only will give me fractions like if I put in 50 enter divide 3 it answers with 50/3. Sometimes it gives me an actual number when I divide something, but usually it gives me fractions,...

Press MODE to bring up the mode screen. Press F3 to bring up the CAS screen. Use the cursor keys to move to the Numeric field. Press F3 if necessary to check it. Move to the Approx field and check this also if necessary. Press ENTER twice to save the changes.

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### I am dividing a 3*1 matrix with a 3*3 matrix with numbers in polar format and it gives me the error data type error.

You'll get the same error if you try to divide two matrices with real numbers. The TI-89 doesn't allow you to divide a matrix by another. However, you can multiply a matrix by the reciprocal of the other.

For example, to calculate A/B, calculate instead A*B^-1 . Makes sure you use the (-) key just to the right of the decimal point key to put in the negative sign before the "1".

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### How I can put my calculator to work for me? I

Hi,
I am afraid you cannot do it with the TI83,because it cannot solve symbolically for y. It can give you y for particular values of x, but cannot give you a general formula for y.

You should strive to be efficient in your reasoning. For exemple simplify your equations as much as you can. For the one you gave, you could have simplified all terms by dividing by 3, leaving 3x-y=3 or y=3x-3. As you can see it is already solved for y.

The function that solves an equation is called solve( . It is accessed through the catalog: [2nd][0] (CATALOG) [LN] (S) then scroll down to find it. Highlight it and press [ENTER].

Hope it helps.

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### When I divided a problem EX. 3/2 the calculator will not answer in decimal

Hi,
You are not dividing problems, you are dividing number. This said, there is a simple way to ensure that the results of divisions are displayed in decimal form: It consists in putting a decimal mark (decimal point) at the end one integer (whole number)
ex:
3/2. gives 1.5
3./2 gives 1.5
3./2. gives 1.5

You can also configure your calculator to display all numerical results in decimal format. To do that press [MODE][F2]. Use the down arrow to select the ligne Exact/Approx, then use the right arrow to unfold the menu options 1:Auto
2:Exact
3:Approximate
Select 3:Approximate and press [ENTER]

Hope it helps.

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### Only whole numbers

Hello,
Press [MODE] [3:Norm][1:Norm1]
Hope it helps.

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