800
847 to the nearest hundred is 800. Since 47 is less than half of 100, you round down.
850
847
It is 300 when rounded to the nearest hundred
916 rounded to the nearest hundred is 900
87.3809 is already rounded to the nearest hundred thousandths. 87.3809 rounded to the nearest thousand is 87.381.
0
0
0
678 is rounded nearest hundred is 700
300