We're going to solve 1615 multiplied by 6428
1615 × 6428 = 6428 × (1615)
+ 6428 × 5 resulting in 32140
+ 6428 × 10 giving us 64280
+ 6428 × 600 what gives us 3856800
+ 6428 × 1000 resulting in 6428000

= 10381220
