No problem, we've got 1509 and 6840 to multiply
1509 × 6840 = 6840 × (1509)
+ 6840 × 9 producing 61560
+ 6840 × 00 producing 0
+ 6840 × 500 resulting in 3420000
+ 6840 × 1000 that results in 6840000

= 10321560
