What do I do to get the fraction 5/8 on my TI-83 Plus calculator?

The Frac command only works if the number can be expressed as a fraction with no more than three digits in the denominator. Since the square root of 5/9 is an irrational number, it cannot be expressed as a fraction at all. The calculator is telling you that the value cannot be adequately approximated as a fraction with three or fewer digits in the denominator.

The Frac command only works if the number can be expressed as a fraction with no more than three digits in the denominator. Since the square root of 5/9 is an irrational number, it cannot be expressed as a fraction at all. The calculator is telling you that the value cannot be adequately approximated as a fraction with three or fewer digits in the denominator.

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 deal with a mixed number you must insert a plus sign between the whole number and, fraction. Such as, (3 plus 2/5). Now in your math processes to stay in this form you use the convert to a fraction command.

The TI-83 doesn't really work with fractions. You can enter a fraction as a quotient. For example, one-third can be entered as (1/3) by pressing ( 1 / 3 ). However, the calculator works with numbers in decimal format. You can convert a result to a fraction by using the >Frac command, available by pressing MATH 1.

The division sign acts like a fraction on the ti-83; to multiply two fractions you may want to wrap them both in parenthesis to get the order of operations correct.
Vote early and often

put the fractions inside brackets
(1/2) x (44/55)

just type it in, e.g. 1/2 or 3/5. if you want to have answers display as fractions, press [MATH] ENTER.

(-3/4)-(-2/5)

You MUST put parenthesis around fractions in a TI-83. If you have a fraction with multiple parts in the numerator or denominator, you MUST put parenthesis around either the numerator or denominator (depending on which one has multiple parts).

E.G.:
X*Y-L/N
Should be Typed
((X*Y-L)/N)

Make Sense?

A fraction is just division of the numerator by the denominator.  So all you have to do is enter the division symbol in place of the fraction bar.  If you are trying to enter a mixed fraction: for example 3 3/5 enter: (3+3/5) were the / is the division button or your calculator.