Alright, let's work through 3940 times 7873 step by step
3940 × 7873 = 7873 × (3940)
+ 7873 × 0 that equals 0
+ 7873 × 40 that is equal 314920
+ 7873 × 900 resulting in 7085700
+ 7873 × 3000 giving us 23619000

= 31019620
