1.8 does not extend further than the tenths place; therefore, it cannot be rounded to the tenths place.
18.6
18.0
18.0
It is then 52.8 when rounded to the nearest tenth
It is then 56.5 when rounded to the nearest tenth
It is 232.4 when rounded to the nearest tenth
It is then 20.2 when rounded to the nearest tenth
It is 0.8 when rounded to the nearest tenth
3451.0
4.4
10775.9
2.7