Alright, let's work through 9964 times 6415 step by step
9964 × 6415 = 6415 × (9964)
+ 6415 × 4 resulting in 25660
+ 6415 × 60 that equals 384900
+ 6415 × 900 resulting in 5773500
+ 6415 × 9000 producing 57735000

= 63919060
