681 rounded to the nearest 10th is easy, If the last number is higher than 5 you round up and if the last number is lower than 5 you round down. So this is meaning the answer for your question is 680.
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 232.4 when rounded to the nearest tenth
It is 12.4 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
4.4
346.21 rounded to the nearest tenth is 346.2.
113.04 rounded to the nearest tenth is 113.0.
0.6