97 rounded to the nearest tens place is 100
308 rounded to the nearest tens place is 310. 308 rounded to the nearest 100s place is 300. It cannot be rounded to the nearest 1000s place.
100
100 doesn't need to be rounded because it is a whole number.
99 rounded to the nearest tens place is 100
It is 95.2 (following the IEEE standard).
Rounded up to the nearest tens would be 100. Rounded to the nearest tens is 90.
500
100
90
1400
349 rounded to the nearest 100 (hundreds place) is 300.