Question about Texas Instruments TI-84 Plus Calculator

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How to get integer form

I would like to know how to get sin(7pi)/4 in integer form, and not in decimals please. Note: I went to "Mode" and selected "Fractions", but it still is giving me an answer in decimals. Thank you.

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At first, set Mode to Radian and then type sin(7pi/4). If you still getting decimal value type key Ans and then Frac.
See captured image.


how to get integer form - 11_28_2012_6_41_50_am.jpg

Posted on Nov 28, 2012

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supportthe85
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SOURCE: fractions multiplied by fraction to get fraction

In the CATALOG there is a >Frac command that can be used with parentheses to multiply fractions.
(1/2)(1/3)>Frac
1/6

Posted on Nov 25, 2008

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SOURCE: Ti89 answers in fraction form not decimal form

This is what I did. Go to Math/ 9.Algebra/ 5.approx(

Posted on Jul 06, 2009

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2 Answers

How do I put this calculator into regular math mode. When I ask it to solve 25/5 it gives me a fraction??


After calculation, just press key [SD] to display it as decimal number.

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If you want to see solutions as decimal numbers press [SHIFT][MODE][2].

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Please rate my answer if I helped you :)

Sep 07, 2011 | Casio FX-115ES Scientific Calculator

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How do I convert any decimal into a fraction?? ex: sin45 is 0.8509035245 (press which buttons to make a fraction)


Not all decimal representations have equivalent fractions. Take pi. Its approximate value as given by the Casio FX9750II is 3.141592654. This is just an approximation because the string of decimal digits in pi has no end. It continues . Such a number that cannot be represented by a ratio of two integers is not rational, not a fraction. It is called irrational.Other such numbers are ?2, ?3,?5, e the base of natural logarithms.
As a matter of principle, if a number is called irrational, it is because it is not rational (not a fraction), and it makes no sense to try to cast it into fraction form.

However, if you truncate an irrational number so as to keep only a finite number of decimal digits, then that truncated number can be represented by a fraction, but qualitatively speaking, it is not the original irrational number.
Thus if you decide to use 3.141500000000000000....0 as an approximate value of pi then you write
3.1415=31415/10000 and the calculator will convert it to the mixed fraction 3u283u2000. To effect this conversion, you press the [FD] key to the right of [a b/c]. If you want an improper fraction 6283u2000 you press [SHIFT][[FD].

As to the value of sin 45 you quote, you should be aware that it is valid for an angle unit in radians.
It is an approximation because the radian unit is based on the value of pi, which, as I said above, is an irrational number.
If you use the degree angle unit, sin45 deg is actually equal to 1/?2 or ?2/2 and this is clearly irrational, and it cannot be represented as a fraction. In conclusion it makes no sense to try to cast it into such form.
On the other hand, sin 30 deg or cos 60 deg are both exactly equal to 1/2. The calculator will convert them to a fraction.

On a more general note, the calculator will always be able to convert a fraction into an approximate decimal number, but the converse may not be possible. It depends on the number of display space available on the screen.

Feb 02, 2011 | Casio FX9750GII Graphic Calculator

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I need the sine of 5 degrees sin(5) in decimal form, how do I get the answer? when I hit enter it just gives me Sin(5).


Assuming you're in degrees mode instead of radians, press diamond then ENTER to convert a symbolic result to decimal.

This can be done in one step by using diamond ENTER instead of ENTER when first calculating the expression. For example:
2ND [SIN] 5 ) diamond ENTER

Sep 20, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Hi, I recently purchased a ti 89 calculator from a friend and I am having the following problem: The calculator will not evaluate trig functions. For example, if I type Sin(Pie/4) and hit enter, the...


The calculator is set up to produce exact results. If you want the expression to be evaluated put a decimal mark at the end of the 4.
to making 4 a floating point number instead of integer.
Alternatively, press the [MODE] key. Scroll down through the pages of options until you reach the line labeled Exact/Approx. When cursor is on that line, use the right arrow key to open the menu. Select [3:Approximate]. Press [ENTER] to save.

Aug 25, 2010 | Texas Instruments TI-89 Calculator

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I have a CA656 model calculator. First, how cann I get it to show teh full answer to my math problems in decimal form. It is rounding to a whole number. Next, how can I calculate sin 30? What steps...


  1. Press MODE 9 to shift into Normal display mode, or MODE 7 and enter the number of digits you want to see.
  2. sin 30 EXE. Be aware that the result depends on the angular mode. Most math problems are specified in radians, while your example sounds like it's in degrees. To select degrees, press MODE 4. To select radians, press MODE 5.
  3. 30 * sin 30 EXE. Everything in #2 above applies.

Aug 14, 2010 | Sentry Office Equipment & Supplies

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[Stat] - Data numbers (frequency) < 1 (not integer) on TI 85 Calc


Frequencies are always integers. They indicate how many times that particular data value came up. The data values may be non-integers.

As an example, let's say you're measuring the weights of widgets. You may have 3 widgets weighing 1.1 kg, 5 widgets weighing 1.2 kg, and 2 widgets weighing 1.3 kg.

Note that the data are non-integers (1.1, 1.2, 1.3) but the frequencies are integers (3, 5, 2).

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Different answer fro my TI-89 AND MY tI-81


Hello,
Your TI81 can only perform numerical calculation: It always give uour numbers. The TI89, a more sophisticated calculator, can of course do numerical calculation, BUT ALSO symbolic ones. You ask it for the derivative of sin(x) and it will give you cos(x).
Anyway, if you want a decimal result for you calculation above one of the numbers must have a decimal point (instead of writing 2PI write 2.PI.

The TI 89 can do exact calculations. But if you want approximate results any number in the sequence of operations must have the mark of a decimal. Numbers without decimal marks are considered integers, Integer numbers with a decimal mark are treated as floating point numbers ( meaning decimal).

Hope it clarifies things for you.

Nov 15, 2008 | Texas Instruments TI-89 Calculator

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Ti-89 titanium SIN!!!!!


The answer that you have received in actuality is correct. However, it is in exact form when the answer that you were looking for was an approximation (decimal form) answer. To achieve this all you have to do is hit the alpha button (the yellow button with a diamond in the center) and then enter which will give you your desired answer :-)

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SIN COS TAN


The answer that you have received in actuality is correct. However, it is in exact form when the answer that you were looking for was an approximation (decimal form) answer. To achieve this all you have to do is hit the alpha button (the yellow button with a diamond in the center) and then enter which will give you your desired answer :-)

Jan 14, 2008 | Texas Instruments TI-89 Calculator

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