Alright, let's work through 5100 times 4055 step by step
5100 × 4055 = 4055 × (5100)
+ 4055 × 0 giving us 0
+ 4055 × 00 what gives us 0
+ 4055 × 100 yielding 405500
+ 4055 × 5000 resulting in 20275000

= 20680500
