491.4
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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
61.52 rounded to nearest tenth = 61.5
3934.9 is rounded to the nearest tenth.
1.4