Let's calculate 3993 x 4707
3993 × 4707 = 4707 × (3993)
+ 4707 × 3 which equals 14121
+ 4707 × 90 what gives us 423630
+ 4707 × 900 that results in 4236300
+ 4707 × 3000 giving us 14121000

= 18795051
