Alright, let's work through 8139 times 3439 step by step
8139 × 3439 = 3439 × (8139)
+ 3439 × 9 resulting in 30951
+ 3439 × 30 what gives us 103170
+ 3439 × 100 which equals 343900
+ 3439 × 8000 giving us 27512000

= 27990021
