lets say you have the number 0.254 to round it to the nearest fourth you round it to 0.25
4 and below round down
5 and up round up
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It means to round the number to the nearest four decimal places (0.0000) for example the number 12.3476589 would be 12.3477 . The four decimal places are the amount of numbers after the decimal dot. For the fourth number after the decimal point, if the number after it is 5 or higher, than you round up to the next decimal number. If it is below five, you leave it as it is. If the fourth number is nine and the next one is eight for example, you also rise the third number as well as the fourth.
7894.494 thousandths is the third number after decimal point the fourth number after decimal point in this number is 7 is greater than or = 5 so round up so the final roudn up answer is 7894.494
the 1/1000 column is the third after the decimal. Look at the fourth number after decimal. If 5 or greater, round up the thousandth column to next higher number; if less than five, keep it the same. Since the fouth number after decimal is 5, round up to 7.139
The nearest hundredth is the same as two decimal places.
That rounds to 5.