Alright, let's work through 8445 times 9905 step by step
8445 × 9905 = 9905 × (8445)
+ 9905 × 5 what gives us 49525
+ 9905 × 40 resulting in 396200
+ 9905 × 400 giving us 3962000
+ 9905 × 8000 which equals 79240000

= 83647725
