Jeremiah has a batting average of 0.312 this baseball season. Express his average as a fraction in lowest terms.

312/1,000

39/125

13/50

13/42

There is not much that can be done to figure out how to write 0.312 as a fraction, except to literally use what the decimal portion of your number, the. 312, means. Since there are 3 digits in 312, the very last digit is the "1000th" decimal place. So we can just say that. 312 is the same as 312/1000.