Alright, let's work through 9720 times 6405 step by step
9720 × 6405 = 6405 × (9720)
+ 6405 × 0 that equals 0
+ 6405 × 20 yielding 128100
+ 6405 × 700 what gives us 4483500
+ 6405 × 9000 what gives us 57645000

= 62256600
