Yes, it is 84. 84 times 4 equals 324.
21 and 4 for a start
42 times 4 equals 168, but so does 2 times 84.
28*21 equals 84
84 times 97 equals 8148
4 times
112
4/84 = 1/21
9 times 28/3 = 84
The answer is 21. The remainder is 0. Please check it on howmanytimes.net/4-go-into-84
84
10