You can do this in several ways. You can round to the nearest decimal; you can also round up, or round down.
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Carried out or written to one decimal place . . . 184.2Rounded to one decimal place . . . . . 184.3
18.69 to one decimal place = 18.7
It is 3.6 to one decimal place
It is 2.7 rounded to one decimal place
3.046 to one decimal place is 3.0.