We're going to solve 3988 multiplied by 4640
3988 × 4640 = 4640 × (3988)
+ 4640 × 8 yielding 37120
+ 4640 × 80 that is equal 371200
+ 4640 × 900 what gives us 4176000
+ 4640 × 3000 what gives us 13920000

= 18504320
