How to round off volume amount to three decimal places

To round a volume amount to three decimal places, you need to look at the fourth decimal place:

1. Identify the third decimal place. This is the digit you want to round to.
2. Look at the digit immediately to its right (the fourth decimal place).
3. If this digit is 5 or greater (5, 6, 7, 8, 9), round up the third decimal place by adding one to it.
4. If this digit is less than 5 (0, 1, 2, 3, 4), keep the third decimal place as it is.
5. Discard all digits after the third decimal place.

Example:

• To round $12.3456\ \text{mL}$ to three decimal places:

  • The third decimal place is 5.
  • The fourth decimal place is 6.
  • Since 6 is 5 or greater, round up the 5 to 6.
  • Result: $12.346\ \text{mL}$

• To round $7.8902\ \text{L}$ to three decimal places:

  • The third decimal place is 0.
  • The fourth decimal place is 2.
  • Since 2 is less than 5, keep the 0 as it is.
  • Result: $7.890\ \text{L}$