We're going to solve 6405 multiplied by 8502
6405 × 8502 = 8502 × (6405)
+ 8502 × 5 yielding 42510
+ 8502 × 00 resulting in 0
+ 8502 × 400 giving us 3400800
+ 8502 × 6000 yielding 51012000

= 54455310
