We're going to solve 7639 multiplied by 8439
7639 × 8439 = 8439 × (7639)
+ 8439 × 9 yielding 75951
+ 8439 × 30 resulting in 253170
+ 8439 × 600 which equals 5063400
+ 8439 × 7000 what gives us 59073000

= 64465521
