Alright, let's work through 8004 times 3954 step by step
8004 × 3954 = 3954 × (8004)
+ 3954 × 4 resulting in 15816
+ 3954 × 00 what gives us 0
+ 3954 × 000 that is equal 0
+ 3954 × 8000 which equals 31632000

= 31647816
