Alright, let's work through 3620 times 399 step by step
3620 × 399 = 399 × (3620)
+ 399 × 0 which equals 0
+ 399 × 20 what gives us 7980
+ 399 × 600 yielding 239400
+ 399 × 3000 that equals 1197000

= 1444380
