Alright, let's work through 9931 times 9909 step by step
9931 × 9909 = 9909 × (9931)
+ 9909 × 1 which equals 9909
+ 9909 × 30 resulting in 297270
+ 9909 × 900 yielding 8918100
+ 9909 × 9000 resulting in 89181000

= 98406279
