To round 0.9999 to three decimal places, follow these steps:
1. Identify the third decimal place: In 0.9999, the third decimal place is the third ‘9’.
2. Look at the fourth decimal place: The fourth decimal place is also ‘9’.
3. Determine whether to round up or stay the same: Since the fourth decimal place is 5 or greater (it’s 9), you round the third decimal place up by 1.
4. Perform the rounding: Adding 1 to the third decimal place (which is 9) results in 10. This means the third decimal place becomes 0, and you carry over the 1 to the second decimal place.
5. Update the number: After rounding, 0.9999 becomes 1.000.
So, 0.9999 rounded to three decimal places is 1.000.