You round it down to 100, as the 2 for tens must be rounded down.
To the nearest ten, 120 To the nearest hundred, 100
121 rounded to the nearest 10 is 120 .
121
It is 300 when rounded to the nearest hundred
916 rounded to the nearest hundred is 900
5800
0
It is already rounded to the nearest hundred thousandths. Rounded to the nearest thousands would be 87.381.
0
10000
0