Alright, let's work through 7945 times 1986 step by step
7945 × 1986 = 1986 × (7945)
+ 1986 × 5 yielding 9930
+ 1986 × 40 resulting in 79440
+ 1986 × 900 what gives us 1787400
+ 1986 × 7000 producing 13902000

= 15778770
