Alright, let's work through 3999 times 9518 step by step
3999 × 9518 = 9518 × (3999)
+ 9518 × 9 what gives us 85662
+ 9518 × 90 resulting in 856620
+ 9518 × 900 giving us 8566200
+ 9518 × 3000 which equals 28554000

= 38062482
