Alright, let's work through 1665 times 6912 step by step
1665 × 6912 = 6912 × (1665)
+ 6912 × 5 that equals 34560
+ 6912 × 60 that equals 414720
+ 6912 × 600 which equals 4147200
+ 6912 × 1000 yielding 6912000

= 11508480
