What is 318 rounding to nearest tenth place?

To the nearest 'TENTH' is 318.0

The 'zero' is in the 'Tenth' place.

However, if you mean the 'ten' place then 318 ~ 320

NB Remember the column names

'3' ; Hundreds

'1' ; Tens

'8' ; Units

Decimal point

'0' ; Tenths. ( Note in decimal digits ; it is '---ths'. suffix. This does not occue in the non-decimal digits.