4839
4839
3<5
4800
To round to the nearest hundred, you look at the hundredth digit (in this case, 8) and the number directly right of it (in this case, 3). If the right number is 5 or more, then you increase the hundredth number by 1 and then turn every number to the right of the hundredth into 0. If the right number is not 5 or more, then you leave the hundredth number as-is and turn every number to its right to 0.
4800
4839.0
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
10000
0
0
678 is rounded nearest hundred is 700
10900