We're going to solve 6643 multiplied by 9220
6643 × 9220 = 9220 × (6643)
+ 9220 × 3 which equals 27660
+ 9220 × 40 that equals 368800
+ 9220 × 600 which equals 5532000
+ 9220 × 6000 what gives us 55320000

= 61248460
