It is important to have the decimal place in the correct position when doing calculations manually.
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Carried out or written to one decimal place . . . 184.2Rounded to one decimal place . . . . . 184.3
The '9' is in the "first decimal" place and the '3' is in the "second decimal" place.Rules for roundingIf the number in the second decimal place is 5 or greater then the number in the first decimal place is rounded upwards by 1.If the number in the second decimal place is 4 or less then the number in the first decimal place is left unchanged.As the problem in this case is 3.93 and the number in the second decimal place is less than 5, we end up with3.9 "correct to one decimal place" or "rounded to one decimal place".
1.1 is to the first decimal place
It is already in 1 decimal place
The first place to the right of the decimal point.