We're going to solve 4085 multiplied by 1992
4085 × 1992 = 1992 × (4085)
+ 1992 × 5 what gives us 9960
+ 1992 × 80 that is equal 159360
+ 1992 × 000 producing 0
+ 1992 × 4000 yielding 7968000

= 8137320
