Alright, let's work through 3987 times 418 step by step
3987 × 418 = 418 × (3987)
+ 418 × 7 that results in 2926
+ 418 × 80 that results in 33440
+ 418 × 900 which equals 376200
+ 418 × 3000 resulting in 1254000

= 1666566
