Let's calculate 2840 x 7991
2840 × 7991 = 7991 × (2840)
+ 7991 × 0 what gives us 0
+ 7991 × 40 resulting in 319640
+ 7991 × 800 that is equal 6392800
+ 7991 × 2000 that results in 15982000

= 22694440
