Alright, let's work through 3942 times 3013 step by step
3942 × 3013 = 3013 × (3942)
+ 3013 × 2 that equals 6026
+ 3013 × 40 yielding 120520
+ 3013 × 900 what gives us 2711700
+ 3013 × 3000 that equals 9039000

= 11877246
