Alright, let's work through 8920 times 1399 step by step
8920 × 1399 = 1399 × (8920)
+ 1399 × 0 that results in 0
+ 1399 × 20 what gives us 27980
+ 1399 × 900 producing 1259100
+ 1399 × 8000 that results in 11192000

= 12479080
