Alright, let's work through 4000 times 5078 step by step
4000 × 5078 = 5078 × (4000)
+ 5078 × 0 which equals 0
+ 5078 × 00 which equals 0
+ 5078 × 000 yielding 0
+ 5078 × 4000 that results in 20312000

= 20312000
