No problem, we've got 6920 and 1689 to multiply
6920 × 1689 = 1689 × (6920)
+ 1689 × 0 which equals 0
+ 1689 × 20 resulting in 33780
+ 1689 × 900 yielding 1520100
+ 1689 × 6000 yielding 10134000

= 11687880
