No problem, we've got 7210 and 1720 to multiply
7210 × 1720 = 1720 × (7210)
+ 1720 × 0 giving us 0
+ 1720 × 10 what gives us 17200
+ 1720 × 200 which equals 344000
+ 1720 × 7000 yielding 12040000

= 12401200
