No problem, we've got 6840 and 9859 to multiply
6840 × 9859 = 9859 × (6840)
+ 9859 × 0 what gives us 0
+ 9859 × 40 giving us 394360
+ 9859 × 800 resulting in 7887200
+ 9859 × 6000 giving us 59154000

= 67435560
