Well, isn't that a happy little question! When we round 2142 to the nearest hundred, we look at the digit in the tens place, which is 4. Since 4 is less than 5, we keep the hundreds place the same, and change the remaining digits to zero. So, 2142 rounded to the nearest hundred is 2100.
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
10900
500
3300
409381900