0.195 = 0.2 rounded to one decimal place
That is to one decimal place (figures after the decimal point).
It is already rounded to one decimal place as 3.6
rounded to 1 decimal place it is 24.7
It's already there.
2.75590551 rounded to the nearest tenths (its one place after the decimal point) is 2.8.
0.1 If you round something to 1 decimal place, you can only have one number after the decimal point, eg 0.109 is 0.1 rounded to 1 decimal place 0.109 is 0.11 rounded to 2 decimal places
It is then 3.4 rounded up to one decimal place
186 doen't have any decimal digits, so it's already "rounded to 1 decimal place".
The thousandths place is the third digit after the decimal point. 86.255 only has 3 digits after the decimal point so it is already (possibly) rounded to the nearest thousandth.
Eight point four. Eight point four. Eight point four. Eight point four.
That would be one point six