We're going to solve 6786 multiplied by 6399
6786 × 6399 = 6399 × (6786)
+ 6399 × 6 yielding 38394
+ 6399 × 80 that is equal 511920
+ 6399 × 700 that equals 4479300
+ 6399 × 6000 that equals 38394000

= 43423614
