Alright, let's work through 2559 times 3430 step by step
2559 × 3430 = 3430 × (2559)
+ 3430 × 9 what gives us 30870
+ 3430 × 50 resulting in 171500
+ 3430 × 500 that is equal 1715000
+ 3430 × 2000 giving us 6860000

= 8777370
