If you were doing it as a long division (in standard layout) then above the 6 - just after the decimal point.
54.5
241.25
104
-1918
-1510
If you mean 18.88 divided by 4 then the quotient is 4.72 and the first digit of 4 is in the ones or units place
54.5
241.25
31
0.6705
647.25
104
It does not have to be. 864/2 = 432. The first digit of the quotient is not in the tens place.
0.6705
-1918
-1510
You look at the place value.