How do i write .012345678901 in fraction form

This answer is correct. 4/12 divided by 2/2= 1/3
The reciprocal of 2/2 is 2/2
Then you multiply straight across and reduce to get 1/3

If you enter the ratios using the fraction entry key ( [a b/c] the results will be displayed as fractions. And when the calculator displays fractions they are always in their reduced form.
In general, when you are manipulating fractions ( Pi/2 is no a fraction even if you write it as one) you can try to simplify them by looking for the greatest common factor (GCF) of the numerator and denominator. When you simplify by the GCF the fraction that is left is in its reduced form.

If you enter the ratios using the fraction entry key ( [a b/c] the results will be displayed as fractions. And when the calculator displays fractions they are always in their reduced form.
In general, when you are manipulating fractions ( Pi/2 is no a fraction even if you write it as one) you can try to simplify them by looking for the greatest common factor (GCF) of the numerator and denominator. When you simplify by the GCF the fraction that is left is in its reduced form.

Do the division, it will be displayed in fraction form.
Then press "Shift S--D" to transform the result in mixed fraction form.
The modulus is the nominator of the fraction.

Example: We need 73 mod 7, we input 73/7= , then we press "Shift S--D" and we get mixed fraction: 10 3/7
3 is the result of 73 mod 7
(and 10 is the result of 73 div 7)

To convert a single result from fraction to decimal, press SD. To have all results come out in decimal, press SHIFT MODE 2 to select LineIO mode.

To convert a single value from fraction to decimal, press SD. To have all results come out in decimal, press SHIFT MODE 2 to select LineIO mode.

For converting answers in decimal to fraction or fraction to decimal there is a S<->D key above delete key.If the answers is in fractional form press this key and it will be converted to decimal form.

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.

When performing the calculations, put the fractions in parentheses. Then once you get your answer, press 2nd and Math (above the times button). Then press F5, MORE, and F1. It will have Ans Frac>. Then hit Enter and it'll change it to a fraction.

Values are displayed in decimal form automatically whenever the total number of digits of a fractional value exceed 10. Otherwise you will have to press the d/c key each time to make it a decimal.