We're going to solve 5180 multiplied by 8421
5180 × 8421 = 8421 × (5180)
+ 8421 × 0 yielding 0
+ 8421 × 80 which equals 673680
+ 8421 × 100 resulting in 842100
+ 8421 × 5000 resulting in 42105000

= 43620780
