Let's calculate 6663 x 7643
6663 × 7643 = 7643 × (6663)
+ 7643 × 3 what gives us 22929
+ 7643 × 60 what gives us 458580
+ 7643 × 600 what gives us 4585800
+ 7643 × 6000 that is equal 45858000

= 50925309
