Alright, let's work through 3988 times 9955 step by step
3988 × 9955 = 9955 × (3988)
+ 9955 × 8 giving us 79640
+ 9955 × 80 giving us 796400
+ 9955 × 900 producing 8959500
+ 9955 × 3000 which equals 29865000

= 39700540
