Alright, let's work through 3936 times 3415 step by step
3936 × 3415 = 3415 × (3936)
+ 3415 × 6 which equals 20490
+ 3415 × 30 what gives us 102450
+ 3415 × 900 yielding 3073500
+ 3415 × 3000 that equals 10245000

= 13441440
