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The fraction button is usually marked [a b/c]. Its shifted function [d/c] converts a mixed number into an improper fraction.
To enter a mixed number, say 7 3/5
Enter 7, press the [a b/c] key, enter 3, press the [a b/c] key, enter 5. Press =/EXE
Yes, you do have the division key. It is the division key. However, if you want the fraction to remain a fraction, enter the numerator, press the division key, type in the denominator then Press [MATH] [1:>Frac] then press ENTER. The fraction that will be displayed will be the reduced form.
The calculator has a key marked with two squares on top of one another and with a fraction bar between them. The key is to the left, below the ABS key.. The shifted function of that key is the mixed fraction [a b/c]. I am not convinced you need a specific key to enter a mixed fraction: you can just type in the integer part (whole part) then + then use the fraction key (the one with the two squares.)
There is no "fraction" button on the TI-83 plus. You will have to press the divide key (2 buttons below the CLEAR key) and then use the parentheses (immediately to the left of the divide key) to tell the calculator the correct order of operations. For example, "1/3x+9" means ".333333x+9", but "1/(3x)+9" means the "x" goes on the bottom of the fraction.
To enter an improper fraction you just use the division button. For a mixed fraction you use the [a b/c] key as follows: 5 3/7: Type 5 [a b/c] 3 [a b/c] 7 [=] To convert a fraction result to an improper fraction use key sequence [2nd] [a b/c] (d/c).
A fraction is in fact a ratio of two number: a division of a numerator by a denominator. The key used for the division operation is the one above the multiplication sign and below the caret [^], and in thee rightmost column of keys.
Beware that this calculator converts any ratio of two numbers into a decimal value. To keep a fraction in a fraction form you must use the [|=>Frac] or [ToFrac] command. To convert a decimal result to a fraction, use the [|=>Dec] command. These commands are accessible through the CATALOG or more easily by pressing [MATH] (under the ALPHA key) and selecting [1:|=>Frac], or [2:|=>Dec] Ex: to keep 27/48 in fraction form you enter 27 [/] 48 [MATH][1:|=>Frac] [ENTER]. Result is 9/16 You will notice that the resulting fraction is reduced to its simplest form. To convert the above result from fraction to decimal press [MATH][2:|=>Dec]
A fraction can always be approximated by a decimal value but the converse is not always possible.
To do fractions, just use the normal divide button.
To see the exact answer, hit MODE and scroll down to Exact/Approx and change to EXACT. In this mode, it will give the fraction always unless you press the special (green button with diamond) before pressing ENTER and it will give the approximate decimal value.