850
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
847 to the nearest hundred is 800. Since 47 is less than half of 100, you round down.
850
600
100
100
800
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