Alright, let's work through 8413 times 1518 step by step
8413 × 1518 = 1518 × (8413)
+ 1518 × 3 which equals 4554
+ 1518 × 10 what gives us 15180
+ 1518 × 400 what gives us 607200
+ 1518 × 8000 what gives us 12144000

= 12770934
