Alright, let's work through 8518 times 6620 step by step
8518 × 6620 = 6620 × (8518)
+ 6620 × 8 yielding 52960
+ 6620 × 10 that equals 66200
+ 6620 × 500 which equals 3310000
+ 6620 × 8000 producing 52960000

= 56389160
