Alright, let's work through 7903 times 9981 step by step
7903 × 9981 = 9981 × (7903)
+ 9981 × 3 what gives us 29943
+ 9981 × 00 producing 0
+ 9981 × 900 producing 8982900
+ 9981 × 7000 what gives us 69867000

= 78879843
