Alright, let's work through 6451 times 7809 step by step
6451 × 7809 = 7809 × (6451)
+ 7809 × 1 yielding 7809
+ 7809 × 50 resulting in 390450
+ 7809 × 400 yielding 3123600
+ 7809 × 6000 that equals 46854000

= 50375859
