To round a number on a digit, look at the next digit (to the right); then if it is 5 or more, add one, otherwise leave alone. Then replace the unneeded digits by zero.
A tenth is the first digit after the decimal point.
For 491.44208 this is 4, and the next digit is also a 4. It is less than 5, so leave alone, and replace all unneeded digits by zero, giving: 491.40000. However, trailing zeros after a decimal point make no difference to the value of the number and so are not written, giving the answer as:
491.4
It is 232.4 when rounded to the nearest tenth
It is then 20.2 when rounded to the nearest tenth
10.5
33.8
79.4
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
4.4
10775.9
2.7
54.4
28.6
965.4
2.1