Alright, let's work through 9001 times 3821 step by step
9001 × 3821 = 3821 × (9001)
+ 3821 × 1 what gives us 3821
+ 3821 × 00 which equals 0
+ 3821 × 000 giving us 0
+ 3821 × 9000 giving us 34389000

= 34392821
