4 can go into 81 twenty whole times. After that, the 81 is still not full, but there is only
enough room left in it for ' 1 ' more, so it is not possible to jam the entire 4 in again.
If you're allowed to cut the 4 up in pieces, then you can use ' 1 ' to fill up the rest
of the 81, and then unobtrusively discard the 3 that you have left over.
4 times with a remainder of 56
11 times with a remainder of 4
81 ÷ 19 = 4 with remainder 5 or 4.2632
20.25 or 25 1/220 times with 1 remaining
81/19 = 4.263 (approx).
4 R 9
11 with remainder 4.
Exactly 81 times
27
Four does not go into 81 evenly. But as "evenly" was not a defined requirement for the answer. 4 goes into 81 20.25 times
20 times with remainder 1.
24/486 = 12/243 = 4/81