We're going to solve 1815 multiplied by 7867
1815 × 7867 = 7867 × (1815)
+ 7867 × 5 yielding 39335
+ 7867 × 10 resulting in 78670
+ 7867 × 800 producing 6293600
+ 7867 × 1000 that is equal 7867000

= 14278605
