Alright, let's work through 6810 times 1987 step by step
6810 × 1987 = 1987 × (6810)
+ 1987 × 0 giving us 0
+ 1987 × 10 producing 19870
+ 1987 × 800 producing 1589600
+ 1987 × 6000 giving us 11922000

= 13531470
