No problem, we've got 7940 and 1809 to multiply
7940 × 1809 = 1809 × (7940)
+ 1809 × 0 that equals 0
+ 1809 × 40 what gives us 72360
+ 1809 × 900 which equals 1628100
+ 1809 × 7000 giving us 12663000

= 14363460
