Here’s how to convert .234 to a fraction…

There is not much that can be done to figure out how to write .234 as a fraction, except to literally use what the decimal portion of your number, the .234, means.

Since there are 3 digits in 234, the very last digit is the "1000th" decimal place.

So we can just say that .234 is the same as 234/1000.

We can reduce this fraction to lowest terms by dividing both the numerator and denominator by 2.

Why divide by 2? 2 is the Greatest Common Divisor (GCD)
or Greatest Common Factor (GCF) of the numbers 234 and 1000.

So, this fraction reduced to lowest terms is 117/500.

HOW TO CONVERT A FRACTION TO A DECIMAL:

OK, so there’s a few steps to set up here in order to convert 5/17 into a decimal.

* First off, we’ll interpret the fraction bar to mean "divided by." This means that 5/17 is the same as 5 divided by 17.

* Second, you have requested to see 3 decimal places in your answer, so we’ll write the 5 as 5.000 instead (a 5 with 3 zeros after the decimal point).

* Now, we’ll just do what the fraction bar says: divide 5.000 by 17:

5/17 = .294
References :
These sites give you the answers.
http://www.webmath.com/dec2fract.html
http://www.webmath.com/fract2dec.html

Type in the decimal.
Press ENTER.

Press MATH.
Go to the first item on the first menu, it should say: >Frac.

Your entry should look like: Ans>Frac.

Press ENTER.

You now have a fraction!
References :
a calculator