Alright, let's work through 3999 times 3264 step by step
3999 × 3264 = 3264 × (3999)
+ 3264 × 9 what gives us 29376
+ 3264 × 90 yielding 293760
+ 3264 × 900 which equals 2937600
+ 3264 × 3000 resulting in 9792000

= 13052736
