Let's calculate 6443 x 8644
6443 × 8644 = 8644 × (6443)
+ 8644 × 3 what gives us 25932
+ 8644 × 40 producing 345760
+ 8644 × 400 that results in 3457600
+ 8644 × 6000 that equals 51864000

= 55693292
