Alright, let's work through 6392 times 6670 step by step
6392 × 6670 = 6670 × (6392)
+ 6670 × 2 what gives us 13340
+ 6670 × 90 yielding 600300
+ 6670 × 300 which equals 2001000
+ 6670 × 6000 what gives us 40020000

= 42634640
