Alright, let's work through 6780 times 9755 step by step
6780 × 9755 = 9755 × (6780)
+ 9755 × 0 giving us 0
+ 9755 × 80 what gives us 780400
+ 9755 × 700 yielding 6828500
+ 9755 × 6000 yielding 58530000

= 66138900
