We're going to solve 4015 multiplied by 4121
4015 × 4121 = 4121 × (4015)
+ 4121 × 5 that is equal 20605
+ 4121 × 10 producing 41210
+ 4121 × 000 which equals 0
+ 4121 × 4000 yielding 16484000

= 16545815
