Well, darling, 9032 rounded to the nearest hundred is 9000. It's as simple as that. No need to make it more complicated than it needs to be.
9000
9000
9030
It is 300 when rounded to the nearest hundred
916 rounded to the nearest hundred is 900
0
It is already rounded to the nearest hundred thousandths. Rounded to the nearest thousands would be 87.381.
0
0
678 is rounded nearest hundred is 700
0
10900