2.0
The first digit after the decimal point is "9". We now look at the second digit after the decimal point. As this is "7", which is greater than or equal to "5", we must round the "9" up (we make the number larger).
This makes the "9" become a "0" and to make this number larger we must also therefore make the "1" into a "2". This is because the "9" has actually become a "10" and so we have to add "1" to the digit to the left (1 + 1 = 2).
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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.