Alright, let's work through 3180 times 3942 step by step
3180 × 3942 = 3942 × (3180)
+ 3942 × 0 which equals 0
+ 3942 × 80 yielding 315360
+ 3942 × 100 giving us 394200
+ 3942 × 3000 resulting in 11826000

= 12535560
