In the number 8.67 the 6 is in the tenths position. To round you use the number to the right of the position you want to round to. If this number is 5 or greater you round up. In this case the number to the right of the tenths digit is a 7 so you round the 6 up becoming a 7. So, . . .
8.67 rounded to the nearest tenth is 8.7
It is then 8.7 when rounded to the nearest tenth
0.9
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
870
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
900
346.21 rounded to the nearest tenth is 346.2.