Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to, in this case, the fourth decimal place. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
0.938
It is already 3 decimal places - nothing more needs to be done.
6.045
The correct answer is 2.782
7.78
85 rounded to three decimal places is 85.000
13.6599 rounded to 3 decimal places is 13.660.
0.938
It is already 3 decimal places - nothing more needs to be done.
It is 7.103
6.045
6.857
99.229
3.446
As there is no decimal point in your set of numbers it is impossible to round it to three decimal places.
86.3624 rounded to 3 decimal places is 86.362.
We can't round 61.65 into 3 decimal places. But 61.65 is equal to 61.650 in three decimal places.