Alright, let's work through 6723 times 9991 step by step
6723 × 9991 = 9991 × (6723)
+ 9991 × 3 what gives us 29973
+ 9991 × 20 resulting in 199820
+ 9991 × 700 that is equal 6993700
+ 9991 × 6000 yielding 59946000

= 67169493
