Alright, let's work through 9910 times 8999 step by step
9910 × 8999 = 8999 × (9910)
+ 8999 × 0 giving us 0
+ 8999 × 10 resulting in 89990
+ 8999 × 900 that is equal 8099100
+ 8999 × 9000 which equals 80991000

= 89180090
