Alright, let's work through 2688 times 1535 step by step
2688 × 1535 = 1535 × (2688)
+ 1535 × 8 yielding 12280
+ 1535 × 80 what gives us 122800
+ 1535 × 600 giving us 921000
+ 1535 × 2000 that equals 3070000

= 4126080
