Alright, let's work through 1616 times 6442 step by step
1616 × 6442 = 6442 × (1616)
+ 6442 × 6 that is equal 38652
+ 6442 × 10 what gives us 64420
+ 6442 × 600 resulting in 3865200
+ 6442 × 1000 which equals 6442000

= 10410272
