815 rounded to the nearest tens is 820
800
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
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
Well, honey, 815 rounded to the nearest ten is 820. It's not rocket science, just bump that 5 up and call it a day. Hope that clears things up for ya!