289 would be rounded up to 300.
300
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
The answer will depend on the degree to which the number is rounded. Without any indication of that, it is not possible to answer the question sensibly.
100
600
100
100
0
555 rounded to the nearest 100 is 600.
97 rounded to the nearest hundred is 100. 97 rounded to the nearest ten is 100
100
100
100