Alright, let's work through 3859 times 7740 step by step
3859 × 7740 = 7740 × (3859)
+ 7740 × 9 that is equal 69660
+ 7740 × 50 that equals 387000
+ 7740 × 800 giving us 6192000
+ 7740 × 3000 resulting in 23220000

= 29868660
