Alright, let's work through 5128 times 9900 step by step
5128 × 9900 = 9900 × (5128)
+ 9900 × 8 that results in 79200
+ 9900 × 20 producing 198000
+ 9900 × 100 that results in 990000
+ 9900 × 5000 which equals 49500000

= 50767200
