Alright, let's work through 4070 times 1999 step by step
4070 × 1999 = 1999 × (4070)
+ 1999 × 0 what gives us 0
+ 1999 × 70 that equals 139930
+ 1999 × 000 that is equal 0
+ 1999 × 4000 giving us 7996000

= 8135930
