Alright, let's work through 3240 times 6355 step by step
3240 × 6355 = 6355 × (3240)
+ 6355 × 0 what gives us 0
+ 6355 × 40 yielding 254200
+ 6355 × 200 producing 1271000
+ 6355 × 3000 giving us 19065000

= 20590200
