Let's calculate 6643 x 6487
6643 × 6487 = 6487 × (6643)
+ 6487 × 3 giving us 19461
+ 6487 × 40 that results in 259480
+ 6487 × 600 that results in 3892200
+ 6487 × 6000 that results in 38922000

= 43093141
