Alright, let's work through 2840 times 9021 step by step
2840 × 9021 = 9021 × (2840)
+ 9021 × 0 producing 0
+ 9021 × 40 what gives us 360840
+ 9021 × 800 yielding 7216800
+ 9021 × 2000 yielding 18042000

= 25619640
