To round to 3 decimal places, look at the 4th decimal digit.<br><br>
&bull; 63.45750 &mdash; the 3rd decimal is 7, the 4th is 5.<br>
&bull; Since the 4th digit is 5 or more, round the 3rd digit up: 7 → 8.<br>
&bull; Drop all digits after the 3rd decimal.<br>
<br>
Final Answer: 63.458