200
To round 951, look at the digit in the tens place, which is 5. Since 5 or greater means you round up, you increase the hundreds place from 900 to 1000, making 951 rounded to the nearest hundred equal to 1000. For 194, the tens digit is 9, so you also round up from 100 to 200, resulting in 194 rounded to the nearest hundred as 200.
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.
190
0
0
0
678 is rounded nearest hundred is 700
409381900
8900