You can put this solution on YOUR website! round to nearest 1000th -0.3898
To the nearest thousandths means that we need to have this number to 3 decimal places.
As the fourth digit, 8, is greater than 5, we need to ROUND UP the previous digit, 9. However, this number when ROUND UP gives us 0, which means that we need to ROUND UP the next preceding digit which is 8.