No problem, we've got 6315 and 8420 to multiply
6315 × 8420 = 8420 × (6315)
+ 8420 × 5 giving us 42100
+ 8420 × 10 producing 84200
+ 8420 × 300 what gives us 2526000
+ 8420 × 6000 yielding 50520000

= 53172300
