Alright, let's work through 3808 times 644 step by step
3808 × 644 = 644 × (3808)
+ 644 × 8 that results in 5152
+ 644 × 00 which equals 0
+ 644 × 800 that is equal 515200
+ 644 × 3000 which equals 1932000

= 2452352
