This is 3.9 when rounded to one dp. Go to the second digit after the decimal place, if this is 5 or more than increase the first decimal place, if it's less than five as in this case, leave the first decimal place as it is.
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to round 68.4 to one decimal place = 68.4
The decimal 13.5 is already rounded to one decimal place.
It will round up to 0.9 to one decimal place
To one decimal place it is 4.1
0.043 rounded to one decimal place is 0.0