No problem, we've got 1391 and 6920 to multiply
1391 × 6920 = 6920 × (1391)
+ 6920 × 1 resulting in 6920
+ 6920 × 90 which equals 622800
+ 6920 × 300 that results in 2076000
+ 6920 × 1000 giving us 6920000

= 9625720
