Alright, let's work through 5128 times 7880 step by step
5128 × 7880 = 7880 × (5128)
+ 7880 × 8 what gives us 63040
+ 7880 × 20 giving us 157600
+ 7880 × 100 resulting in 788000
+ 7880 × 5000 yielding 39400000

= 40408640
