500
500
There are infinitely many numbers in the range [495, 505].
639.0
It then is 70 when rounded to the nearest ten
It is then 740 when rounded to the nearest ten.
81,215 rounded to the nearest ten thousands is 80,000
30
6512162 rounded to the nearest ten is 6512160.
2602 rounded to the nearest ten is 2600.
320