500
500. Since the 9 is in the tenth's place you look at the number behind it. If that number is equal to or more than 5 you round up.
Anything from 495 to 504
There are infinitely many numbers in the range [495, 505].
60
It is then 740 when rounded to the nearest ten.
30
36,184 rounded to the nearest ten thousands place is 40,000.
2602 rounded to the nearest ten is 2600.
320
20
260
Rounded to the nearest ten it is: 564,630
5240