Alright, let's work through 1681 times 6401 step by step
1681 × 6401 = 6401 × (1681)
+ 6401 × 1 that is equal 6401
+ 6401 × 80 that equals 512080
+ 6401 × 600 producing 3840600
+ 6401 × 1000 producing 6401000

= 10760081
