Let's calculate 3994 x 1986
3994 × 1986 = 1986 × (3994)
+ 1986 × 4 that is equal 7944
+ 1986 × 90 that results in 178740
+ 1986 × 900 resulting in 1787400
+ 1986 × 3000 which equals 5958000

= 7932084
