Let's calculate 6387 x 3607
6387 × 3607 = 3607 × (6387)
+ 3607 × 7 that results in 25249
+ 3607 × 80 that results in 288560
+ 3607 × 300 that is equal 1082100
+ 3607 × 6000 giving us 21642000

= 23037909
