864.00
0.9
It is 300 when rounded to the nearest hundred
916 rounded to the nearest hundred is 900
5800
0
If the 864 refers to meters, then it's already rounded to the nearest meter. If it refers to something else, you need to tell us what it is.
It is already rounded to the nearest hundred thousandths. Rounded to the nearest thousands would be 87.381.
0
10000
0
678 is rounded nearest hundred is 700