Alright, let's work through 8151 times 4905 step by step
8151 × 4905 = 4905 × (8151)
+ 4905 × 1 yielding 4905
+ 4905 × 50 that results in 245250
+ 4905 × 100 yielding 490500
+ 4905 × 8000 that is equal 39240000

= 39980655
