No problem, we've got 1380 and 3686 to multiply
1380 × 3686 = 3686 × (1380)
+ 3686 × 0 which equals 0
+ 3686 × 80 producing 294880
+ 3686 × 300 yielding 1105800
+ 3686 × 1000 producing 3686000

= 5086680
