Alright, let's work through 8831 times 1993 step by step
8831 × 1993 = 1993 × (8831)
+ 1993 × 1 giving us 1993
+ 1993 × 30 giving us 59790
+ 1993 × 800 giving us 1594400
+ 1993 × 8000 which equals 15944000

= 17600183
