Well, honey, 88 rounded to the nearest hundred is still 100. You can't just snap your fingers and make it magically become 88. It's like asking for a glass of wine and getting Grape Juice instead. Close, but not quite there, darling.
949 to the nearest ten is 950. 949 to the nearest hundred is 900.
88 to the nearest hundred is 100
It is 300 when rounded to the nearest hundred
916 rounded to the nearest hundred is 900
It is 90 when rounded to the nearest ten
0
It is already rounded to the nearest hundred thousandths. Rounded to the nearest thousands would be 87.381.
0
10000
0
0
678 is rounded nearest hundred is 700