No problem, we've got 1685 and 5160 to multiply
1685 × 5160 = 5160 × (1685)
+ 5160 × 5 that is equal 25800
+ 5160 × 80 that equals 412800
+ 5160 × 600 producing 3096000
+ 5160 × 1000 resulting in 5160000

= 8694600
