99 + 99 + 88 + 88 + 72 + 72 = 518
88 is an even number 99 is an odd number 99 - 88 =11
0.8889
88 times 99 is equal to 8712.
The sum of 88 and 11 is 99.
It's not the number 99. The fire marks are the tread marks of the DeLorean when it goes back in time. Apparently the DeLorean does a loop and hits 88 MPH and goes back to the Old West.
8712
187
-88
88
From 88 to 99 will interchange.
88/99 - 81/99 = 7/99