We're going to solve 6680 multiplied by 7728
6680 × 7728 = 7728 × (6680)
+ 7728 × 0 what gives us 0
+ 7728 × 80 what gives us 618240
+ 7728 × 600 which equals 4636800
+ 7728 × 6000 which equals 46368000

= 51623040
