Alright, let's work through 8413 times 8378 step by step
8413 × 8378 = 8378 × (8413)
+ 8378 × 3 that is equal 25134
+ 8378 × 10 yielding 83780
+ 8378 × 400 that results in 3351200
+ 8378 × 8000 producing 67024000

= 70484114
