Alright, let's work through 3540 times 6891 step by step
3540 × 6891 = 6891 × (3540)
+ 6891 × 0 giving us 0
+ 6891 × 40 resulting in 275640
+ 6891 × 500 what gives us 3445500
+ 6891 × 3000 what gives us 20673000

= 24394140
