No problem, we've got 3100 and 7200 to multiply
3100 × 7200 = 7200 × (3100)
+ 7200 × 0 resulting in 0
+ 7200 × 00 which equals 0
+ 7200 × 100 yielding 720000
+ 7200 × 3000 which equals 21600000

= 22320000
