Alright, let's work through 2859 times 6640 step by step
2859 × 6640 = 6640 × (2859)
+ 6640 × 9 that results in 59760
+ 6640 × 50 what gives us 332000
+ 6640 × 800 that results in 5312000
+ 6640 × 2000 yielding 13280000

= 18983760
