We're going to solve 8406 multiplied by 3870
8406 × 3870 = 3870 × (8406)
+ 3870 × 6 which equals 23220
+ 3870 × 00 producing 0
+ 3870 × 400 producing 1548000
+ 3870 × 8000 producing 30960000

= 32531220
