It is: 100
11,000. 982 rounded to the nearest hundred is 1,000 (effectively 10 100's).
600
100
That is 4800
4198 to the nearest 100 = 4200
100
100
100
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
2500 is already at the nearest 100.
599 to the nearest 100 is 600.