Alright, let's work through 4185 times 3821 step by step
4185 × 3821 = 3821 × (4185)
+ 3821 × 5 that equals 19105
+ 3821 × 80 that is equal 305680
+ 3821 × 100 giving us 382100
+ 3821 × 4000 that equals 15284000

= 15990885
