3.0
35.6
3.3
52.0
Rounded to the nearest tenth, there can be only one decimal. And that is 7.8
72.0
35% as a decimal is 0.35 and rounded to the nearest tenth it is 0.4
23.0
15.0
11.0
It is 0.0 : the zero after the decimal point is an indication that the number is rounded to the nearest tenth.
1000.0
The square root of 2 is an irrational number and rounded to the nearest tenth it is 1.4