1.83 is 1.8 when rounded to one decimal place. The reason for this is the rule of thumb where 1 to 4 you round down, 5 to 9 you round up, in your case it's 3, thus you round down.
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It is already rounded to exactly that degree.
It is 44.3 when rounded to one decimal place
44.98 rounded to one decimal place is 45.0
0.086 rounded to one decimal place is 0.1.
It is 28.0 rounded to one decimal place