Let's calculate 6443 x 5643
6443 × 5643 = 5643 × (6443)
+ 5643 × 3 that results in 16929
+ 5643 × 40 resulting in 225720
+ 5643 × 400 what gives us 2257200
+ 5643 × 6000 producing 33858000

= 36357849
