Answer: What is "A" rounded to the nearest thousandth? answer: 6.340
What is "A" rounded to the nearest hundredth? Answer: 6.300
Step-by-step explanation: When you look to the right of the number place you are rounding, then it will tell you whether to round up or down, if it 4 or lower, then you round down by one digit, if it is 5 or higher, then you round up. Add any zeros if necessary.
Hope this helps, I'm doing math too, just taking a break to help someone else out.