Alright, let's work through 9902 times 9131 step by step
9902 × 9131 = 9131 × (9902)
+ 9131 × 2 that is equal 18262
+ 9131 × 00 that results in 0
+ 9131 × 900 yielding 8217900
+ 9131 × 9000 giving us 82179000

= 90415162
