800
820
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
816 to the nearest hundred is 800. This is because the value of the tens place "1" is less than 5. When rounding anything less than 5 gets rounded down while anything equal to or greater than 5 gets rounded up.
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