100
100.
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
100
102 = 100, 112 = 121 ...
121 rounded to the nearest 10 is 120 .
121
121/100 = 121/100
-1.21 = -121/100 and reduces to: -1 21/100
It is 121/100.
120