Alright, let's work through 6640 times 2861 step by step
6640 × 2861 = 2861 × (6640)
+ 2861 × 0 which equals 0
+ 2861 × 40 resulting in 114440
+ 2861 × 600 giving us 1716600
+ 2861 × 6000 that equals 17166000

= 18997040
