Alright, let's work through 5668 times 1390 step by step
5668 × 1390 = 1390 × (5668)
+ 1390 × 8 that results in 11120
+ 1390 × 60 what gives us 83400
+ 1390 × 600 resulting in 834000
+ 1390 × 5000 yielding 6950000

= 7878520
