We're going to solve 4015 multiplied by 4520
4015 × 4520 = 4520 × (4015)
+ 4520 × 5 which equals 22600
+ 4520 × 10 which equals 45200
+ 4520 × 000 giving us 0
+ 4520 × 4000 yielding 18080000

= 18147800
