815 rounded to the nearest tens is 820
800
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
When rounding 815 to the nearest ten, you look at the digit in the tens place, which is 1. Since this digit is less than 5, you round down. Therefore, 815 rounded to the nearest ten is 810.
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
100