Alright, let's work through 6678 times 7638 step by step
6678 × 7638 = 7638 × (6678)
+ 7638 × 8 that results in 61104
+ 7638 × 70 giving us 534660
+ 7638 × 600 that results in 4582800
+ 7638 × 6000 that results in 45828000

= 51006564
