As 572 is only 28 less than 600 but 72 more than 500 it is obviously nearest to 600.
122 to the nearest 100 is 100
103 to the nearest hundreds is 100
100
That is 4800
4198 to the nearest 100 = 4200
100
100
100
75 rounded to the nearest 100 is 100.
100
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
2500 is already at the nearest 100.