We're going to solve 3120 multiplied by 5615
3120 × 5615 = 5615 × (3120)
+ 5615 × 0 giving us 0
+ 5615 × 20 resulting in 112300
+ 5615 × 100 what gives us 561500
+ 5615 × 3000 giving us 16845000

= 17518800
