5,451 rounded to the nearest hundred is: 5,500. This is because the value in the tens place is "5". When rounding anything equal to or greater than 5 gets rounded up while everything else gets rounded down.
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
0
678 is rounded nearest hundred is 700
409381900
8900
0
10900