Alright, let's work through 3828 times 4009 step by step
3828 × 4009 = 4009 × (3828)
+ 4009 × 8 that is equal 32072
+ 4009 × 20 that equals 80180
+ 4009 × 800 which equals 3207200
+ 4009 × 3000 which equals 12027000

= 15346452
