0 (zero)
The rule in rounding off is that if the first figure to be discarded is a 5 or more, the previous figure is increased by 1.
As the number is being rounded to the nearest hundred then 46 can be regarded as 046. As 4 (the first figure to be discarded) is less than 5, then the previous number (0) remains unchanged. Therefore, 046 becomes 000 or simply 0.
5300
It is 300 when rounded to the nearest hundred
916 rounded to the nearest hundred is 900
5800
0
46
0
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