The nearest hundred to 728 is 700. (728 is closer to 700 than it is to 800).
700
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
500