No problem, we've got 3485 and 6720 to multiply
3485 × 6720 = 6720 × (3485)
+ 6720 × 5 giving us 33600
+ 6720 × 80 that equals 537600
+ 6720 × 400 what gives us 2688000
+ 6720 × 3000 which equals 20160000

= 23419200
