0.0
It depends on what comes after the zero tenth. If the number that comes after it is less than 5, then you would round down to zero tenth. If the number that comes after it is 5 or greater, you would round up to one tenth.
4.02 rounds to 4.0.
4.06 rounds to 4.1.
0.7
0.0
0.0
4.8
0
0.0
0
0.0
4.8
1.0
0
The answer depends on the degree of rounding. To the nearest tenth (or smaller) it is 1 tenth. To the nearest unit (or bigger) it is 0.
3.12 rounded to the nearest tenth is 3.1. Rounded to the nearest one is 3. Rounded to the nearest ten is 0.