Alright, let's work through 6435 times 1780 step by step
6435 × 1780 = 1780 × (6435)
+ 1780 × 5 yielding 8900
+ 1780 × 30 that is equal 53400
+ 1780 × 400 resulting in 712000
+ 1780 × 6000 giving us 10680000

= 11454300
