It is 0.1999... with the 9s repeating.
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It is 0.1
The number 51.2 is known as a decimal. The decimal is in the 10th place.
9/10 as a decimal is 0.9
It is 2.6457513111
To round to nearest 10th, look at the 100th place. If it is 5 or more, round the 10ths place up, otherwise leave it the same, and drop the rest of the decimal. So 5.524 rounded to the nearest 10th is 5.5, since the 100ths place is 2.