Question about Texas Instruments TI-85 Calculator

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Fractions multiplied by fraction to get fraction

I have a Texal Instrumen TI-85 calculator. I was wondering how to multiply fractions to get answers as fractions and not decimals???

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  • ttfn Sep 02, 2008

    I'm trying to solve fractions with my calculator but am not sure how to input them any suggestions?

  • Ray McGill Oct 07, 2008

    Yes, my daughter found same thing. I think using parens is a workaround, and then there is a function buried in math>misc somewhere.

  • Anonymous Mar 27, 2014

    cross multiply to find equal fraction, or the unknown factor



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In the CATALOG there is a >Frac command that can be used with parentheses to multiply fractions.

Posted on Nov 25, 2008

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What is 3/4 multiplied by 3 1/3

Posted on Mar 02, 2015


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Convert decimal fraction to binary

None of these solutions answer his question. When converting a fraction or any number with decimal places to Binary, the TI-89 gives "Error: Domain error." For example, entering .6875 [2ND][MATH][BASE][BIN] does not work. I haven't found a way to do it with built in functions. In order to do these types of conversions, I use the following method.

Convert: 0.6875 to Binary
- left of decimal is a 0, so write down a 0, then a decimal point: (0.)
- multiply .6875 x 2 = 1.375 left of decimal is 1, write a 1: (0.1)
- drop the 1 and multiply .375 x 2 = .75 left of decimal is 0. write a 0: (0.10)
- multiply .75 x 2 = 1.5 left of decimal is 1, write a 1: (0.101)

- drop the 1, multiple .5 x 2 = 1. left of decimal is 1, write a 1: (0.1011).
- since there is no more fraction, the final answer is (0.1011). Hope this helps.

Jan 27, 2012 | Texas Instruments TI-89 Calculator

1 Answer

Hi i have a TI-34-II and i need someone to tel me how to change a fraction into a percent and how to chance a fraction into a decimal. please help!!

One can express percentages as fractions. Say you have 60% and you want to change this into a fraction. you can also express this as 60/100 because all percentages are are parts of 100. So to change a fraction into a percent you would just convert the fraction into a decimal by dividing (3/4 = .75). Then to get the percentage you just multiply the decimal by 100 to get the percent. (75x100=75%

May 02, 2011 | Texas Instruments TI-34II Explorer Plus...

1 Answer

When i try to use the pi key with another operation it does not compute. For example if I am trying to multiply 10 times pi, the calculator reads 10pi

Press the FD (fraction to decimal) button after you calculate 10 times pi, This will give you the
calculation in decimal form.

Mar 11, 2011 | Texas Instruments TI-15 Explorer...

1 Answer

TI-89 decimal to fraction

Here is what you do:

1) Press the Mode button.
2) Scroll down the list that appears until you find "Exact/Approx".
3) Change the setting for "Exact/Approx" to Exact.
4) Press enter to save the settings change.

You have three possible settings for "Exact/Approx":
1) Auto - The calculator will try to determine the best format.
2) Exact - The calculator will always give the answer in fraction form.
3) Approximate - The calculator will always give the answer in decimal form.

Nov 15, 2009 | Texas Instruments TI-89 Calculator

1 Answer

How to us a fraction on the ti-83 calculator? I have home work due on this tues. and i dont know how to put a fraction in on this calculator .


Ther e is no dedicated key to do that but ther is a command ToFrac noted as ->Frac. To access it use [MATH[1:->Frac].

Two ways of using the command.
1. You want to reduce a fraction to its simplest expression
27/48 [MATH][1:->Frac] [ENTER] gives the reduced fraction 9/16

2 You do not want your results converted to decimal numbers

(27/48) [x] (5/7) [MATH][1:->Frac][ENTER] multiplies the two fractions and gives a fraction as a result. 45/112

3. Your result is in decimal form and you want to cast it into a fraction. The conversion will be exact only for certain numbers. Results kept in fraction forms are more accurate than those represented as decimals.
Hope it answers your question.

Oct 10, 2009 | Texas Instruments TI-83 Plus Calculator

2 Answers

I need to convert decimals to fractions

Press [MATH][1:ToFrac] to convert an aswer to fraction.
If you enter 18.52[ToFrac] [ENTER gives 463/25

[MATH][2:ToDEC] converts a fraction to a decimal number.
Hope it helps.

Sep 22, 2009 | Texas Instruments TI-84 Plus Silver...

2 Answers

Casio fx-115 es ---- turning decimal answers into radical form


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.

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

2 Answers

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

1 Answer

Decimals to fractions

Use the [2nd][MATH] keys. Scroll right [F6] to the softmenu [->Frac or To Frac].
Hope it helps.

Jan 16, 2009 | Texas Instruments TI-86 Calculator

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