Alright, let's work through 7640 times 646 step by step
7640 × 646 = 646 × (7640)
+ 646 × 0 that results in 0
+ 646 × 40 resulting in 25840
+ 646 × 600 that results in 387600
+ 646 × 7000 which equals 4522000

= 4935440
