Alright, let's work through 1988 times 1987 step by step
1988 × 1987 = 1987 × (1988)
+ 1987 × 8 that results in 15896
+ 1987 × 80 which equals 158960
+ 1987 × 900 what gives us 1788300
+ 1987 × 1000 producing 1987000

= 3950156
