We're going to solve 2543 multiplied by 1280
2543 × 1280 = 1280 × (2543)
+ 1280 × 3 that equals 3840
+ 1280 × 40 what gives us 51200
+ 1280 × 500 which equals 640000
+ 1280 × 2000 that results in 2560000

= 3255040
