Alright, let's work through 6440 times 1826 step by step
6440 × 1826 = 1826 × (6440)
+ 1826 × 0 that is equal 0
+ 1826 × 40 producing 73040
+ 1826 × 400 producing 730400
+ 1826 × 6000 that is equal 10956000

= 11759440
