We're going to solve 7860 multiplied by 3978
7860 × 3978 = 3978 × (7860)
+ 3978 × 0 what gives us 0
+ 3978 × 60 giving us 238680
+ 3978 × 800 resulting in 3182400
+ 3978 × 7000 yielding 27846000

= 31267080
