We're going to solve 3924 multiplied by 3115
3924 × 3115 = 3115 × (3924)
+ 3115 × 4 which equals 12460
+ 3115 × 20 resulting in 62300
+ 3115 × 900 that is equal 2803500
+ 3115 × 3000 that results in 9345000

= 12223260
