There are lots of possiblities:
2*42
3*28
etc.
More specific please.
40+40+8
63-84 equals = -21
28*21 equals 84
42 times 2 equals 84.
4 times 21 equals 84.
13,440 divided by 160 equals 84.
112
84 - 7 = 77
84 divided by 1 is equal to 84.
28x3=84
186
196
84 inches = 7 feet