10.5 seconds. When you round off to the nearest tenth, look at the hundredth number. If it is less than 5 (exclusive of 5), just remove all the numbers from the hundredth digit. If it is at least 5, add 1 to the tenth digit, then remove all digits from the hundredth onwards.
It is then 20.2 when rounded to the nearest tenth
It is 232.4 when rounded to the nearest tenth
It is 12.4 rounded to the nearest tenth
It is already rounded to the nearest tenth as 26.0
168.6
It depends on the units used for 25.4. 25.4 hours or milliseconds? centuries or nanoseconds?
It is 5.2 when rounded to the nearest tenths.
65.6
It is then 52.8 when rounded to the nearest tenth
It is then 56.5 when rounded to the nearest tenth
It is 0.8 when rounded to the nearest tenth
It is then 20.2 when rounded to the nearest tenth
It is 232.4 when rounded to the nearest tenth
It is 12.4 rounded to the nearest tenth
4.4
113.04 rounded to the nearest tenth is 113.0.
346.21 rounded to the nearest tenth is 346.2.