Alright, let's work through 1987 times 9638 step by step
1987 × 9638 = 9638 × (1987)
+ 9638 × 7 that is equal 67466
+ 9638 × 80 yielding 771040
+ 9638 × 900 giving us 8674200
+ 9638 × 1000 that results in 9638000

= 19150706
