We're going to solve 4005 multiplied by 6403
4005 × 6403 = 6403 × (4005)
+ 6403 × 5 yielding 32015
+ 6403 × 00 yielding 0
+ 6403 × 000 that is equal 0
+ 6403 × 4000 that is equal 25612000

= 25644015
