Alright, let's work through 7922 times 2621 step by step
7922 × 2621 = 2621 × (7922)
+ 2621 × 2 giving us 5242
+ 2621 × 20 producing 52420
+ 2621 × 900 that is equal 2358900
+ 2621 × 7000 that is equal 18347000

= 20763562
