We're going to solve 6643 multiplied by 1760
6643 × 1760 = 1760 × (6643)
+ 1760 × 3 producing 5280
+ 1760 × 40 that is equal 70400
+ 1760 × 600 which equals 1056000
+ 1760 × 6000 that results in 10560000

= 11691680
