2539, 2541 and 2542 rounded to the nearest ten will round to 2540.
3000
2,500
0
2540
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
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