We're going to solve 1803 multiplied by 8387
1803 × 8387 = 8387 × (1803)
+ 8387 × 3 yielding 25161
+ 8387 × 00 which equals 0
+ 8387 × 800 giving us 6709600
+ 8387 × 1000 yielding 8387000

= 15121761
