Alright, let's work through 4039 times 280 step by step
4039 × 280 = 280 × (4039)
+ 280 × 9 giving us 2520
+ 280 × 30 resulting in 8400
+ 280 × 000 what gives us 0
+ 280 × 4000 that is equal 1120000

= 1130920
