Let's calculate 3993 x 3990
3993 × 3990 = 3990 × (3993)
+ 3990 × 3 that is equal 11970
+ 3990 × 90 producing 359100
+ 3990 × 900 what gives us 3591000
+ 3990 × 3000 that is equal 11970000

= 15932070
