16.7049 to 3dp is 16.705.
The 4th decimal place decided whether to round up, or not, the first three places. The 4th dp in this case is 9, so it rounds up.
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17.635 already is rounded to 3 decimal places.
It is 87.656 when rounded to 3 decimal places
It is 3.540 rounded to 3 decimal places
85 rounded to three decimal places is 85.000
13.6599 rounded to 3 decimal places is 13.660.