Alright, let's work through 7990 times 2605 step by step
7990 × 2605 = 2605 × (7990)
+ 2605 × 0 that results in 0
+ 2605 × 90 producing 234450
+ 2605 × 900 which equals 2344500
+ 2605 × 7000 yielding 18235000

= 20813950
