When rounding up if a number is 5 or more you add one to the next column. If a number is 4 or less you just ignore it. So 1.632 becomes 1.63 (2 is less than 5 so it is dropped). This then becomes 1.6 (3 is dropped because it is less than 5).
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It already is rounded to one decimal place.
To get the decimal, divide the numerator of the fraction by the denominator. If the decimal runs to more than one place, then you have to round it to one decimal place.
To one decimal place it is rounded to 0.9
0.6 is at one decimal place, so no change is needed.
It is 5.9 when rounded to one decimal place.