Alright, let's work through 8400 times 2007 step by step
8400 × 2007 = 2007 × (8400)
+ 2007 × 0 what gives us 0
+ 2007 × 00 that equals 0
+ 2007 × 400 which equals 802800
+ 2007 × 8000 that equals 16056000

= 16858800
