Let's calculate 4321 x 3521
4321 × 3521 = 3521 × (4321)
+ 3521 × 1 that results in 3521
+ 3521 × 20 yielding 70420
+ 3521 × 300 that is equal 1056300
+ 3521 × 4000 that results in 14084000

= 15214241
