We're going to solve 7809 multiplied by 1320
7809 × 1320 = 1320 × (7809)
+ 1320 × 9 that results in 11880
+ 1320 × 00 that is equal 0
+ 1320 × 800 that equals 1056000
+ 1320 × 7000 what gives us 9240000

= 10307880
