Alright, let's work through 3840 times 6446 step by step
3840 × 6446 = 6446 × (3840)
+ 6446 × 0 giving us 0
+ 6446 × 40 that is equal 257840
+ 6446 × 800 giving us 5156800
+ 6446 × 3000 giving us 19338000

= 24752640
