Alright, let's work through 9905 times 8445 step by step
9905 × 8445 = 8445 × (9905)
+ 8445 × 5 giving us 42225
+ 8445 × 00 what gives us 0
+ 8445 × 900 resulting in 7600500
+ 8445 × 9000 giving us 76005000

= 83647725
