Alright, let's work through 3820 times 7640 step by step
3820 × 7640 = 7640 × (3820)
+ 7640 × 0 producing 0
+ 7640 × 20 that results in 152800
+ 7640 × 800 resulting in 6112000
+ 7640 × 3000 giving us 22920000

= 29184800
