Alright, let's work through 5123 times 9921 step by step
5123 × 9921 = 9921 × (5123)
+ 9921 × 3 what gives us 29763
+ 9921 × 20 that is equal 198420
+ 9921 × 100 resulting in 992100
+ 9921 × 5000 what gives us 49605000

= 50825283
