Alright, let's work through 9040 times 9072 step by step
9040 × 9072 = 9072 × (9040)
+ 9072 × 0 that is equal 0
+ 9072 × 40 that is equal 362880
+ 9072 × 000 giving us 0
+ 9072 × 9000 yielding 81648000

= 82010880
