We're going to solve 6640 multiplied by 6911
6640 × 6911 = 6911 × (6640)
+ 6911 × 0 which equals 0
+ 6911 × 40 resulting in 276440
+ 6911 × 600 that equals 4146600
+ 6911 × 6000 producing 41466000

= 45889040
