What is 3.125 as a fraction?

3.125 can be written as a fraction as 25/8.

To convert the decimal 3.125 to a fraction, you need to recognize that the decimal part .125 represents 125 thousandths.

Since there are three digits after the decimal point, you can put the decimal part over a power of 10 with the same number of digits. In this case, it would be 125/1000.

Then, simplifying this fraction by dividing the numerator and denominator by their greatest common factor, which is 125, results in 1/8.

Finally, multiplying the whole number part, which is 3, by the denominator of the fraction, gives 3 * 8 = 24. Adding this to the numerator of the fraction, 24 + 1 = 25. Therefore, the fraction representation of 3.125 is 25/8.