We have the number :
The hundredth number is the second rounded number before the point, in this case, 8:
Then 0.3898, the thousandths is 9 and the ten-thousandths is 8
so rounded the thousandths 9 according to the ten-thousandths is 8
The answer for rounded thousandths is: 0.390
Because ten-thousandths is 8 is over 5 and also the thousandths 9
The nearest thousandth is the third digit after the decimal point.
0.390 =
ones-tenth -hundredth - thousandth