To round to 3 decimal places, look at the digit in the 4th decimal place.
• 12.34567 → the 3rd decimal digit is 5, the 4th decimal digit is 6
• The 4th decimal digit is 6, which is 5 or more, so we round up
• 5 becomes 6
• 12.34567 rounded to 3 decimal places = 12.346
Final Answer: 12.346