Alright, let's work through 6450 times 7999 step by step
6450 × 7999 = 7999 × (6450)
+ 7999 × 0 that results in 0
+ 7999 × 50 what gives us 399950
+ 7999 × 400 that results in 3199600
+ 7999 × 6000 giving us 47994000

= 51593550
