Alright, let's work through 6456 times 7779 step by step
6456 × 7779 = 7779 × (6456)
+ 7779 × 6 which equals 46674
+ 7779 × 50 that equals 388950
+ 7779 × 400 resulting in 3111600
+ 7779 × 6000 that results in 46674000

= 50221224
