Alright, let's work through 2814 times 640 step by step
2814 × 640 = 640 × (2814)
+ 640 × 4 giving us 2560
+ 640 × 10 that equals 6400
+ 640 × 800 what gives us 512000
+ 640 × 2000 producing 1280000

= 1800960
