Which of the following fractions is the closest to 1? 7/8 8/7 9/10 10/11 11/10

3/4 Is closest to 1. Because 4/4 is equal to 1

.0833333333r

Look for a key marked [a b/c]. If you have it, its shifted function should be marked [d/c]. To enter a fraction using the [a b/c] you enter the integer part, then press [a b/c], enter the numerator of the fraction part, then press [a b/c] followed by the denominator.
Type in 13 and 7/9 you do as follows
13 [a b/c] 7 [a b/c] 9 followed by [=].
To convert it to an improper fraction, press [Shift/2nd/ 2nd F] [a b/c] to get 124/9.

There must be an error in the question. Could it be fraction to decimal?
The MATH menu has two options 1:>Frac, 2:>Dec.
The first entered on the command line after a fraction keeps the result in (reduced) fraction form. On a displayed result, it converts a decimal into a fraction.
The second 2:>DEC converts a fraction into a decimal number.

The latest OS (2.53MP and following) has a better handling for fractions.

To enter the fraction two-thirds (2/3), first enter the number two. Then press the key that is the letter n with a bar underneath it. This will designate the 2 as the numerator of the fraction. Then, enter the number 3 followed by the key that is the letter d with a bar over it. That designates the 3 as the denominator of the fraction.
Any fraction can be inputted in the same manner. First the numerator followed by the n with a bar under it, then the denominator followed by the d with the bar over it. Once your fraction is inputted, continue with your computations as normal.

Calculation results will be displayed using
fractions, r, and ?. When you press CHANGE, the display will cycle
through the following display styles:
• Mixed fractions (with or without ?) ? improper fractions (with
or without ?) ? decimal numbers
• Proper fractions (with or without ?) ? decimal numbers.

Use the following buttons to complete your requested fractional input/output: 2nd & {MATH} {MISC} > FRAC. Displays a fraction, displays a result as a rational equivalent. The argument can be a real or complex number, list, matrix, or vector.

If you want to enter an improper fraction, you enter it with the [a b/c] key as follows
numerator [a b/c] denominator.
If you want to enter a mixed fraction do as follows
interger [a b/c] numerator [a/c] denominator
If you want to convert a mixed fraction to an improper fraction use the key sequence [2nd or SHIFT] [d/c]

Enter any fraction as a division problem and your TI 83 will evaluate it as a fraction.

For instance, 3/4 = three fourths.

follow the following sequence of steps
mode>exact/approx and then select approx