12300
The number 12345 rounded to the nearest ten is 12350, since the digit in the ones place (5) rounds up the tens place. If rounded to the nearest hundred, it becomes 12300, as the digit in the tens place (4) does not prompt an increase. Similarly, rounded to the nearest thousand, it is 12000.
12300
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