Alright, let's work through 3129 times 6609 step by step
3129 × 6609 = 6609 × (3129)
+ 6609 × 9 giving us 59481
+ 6609 × 20 giving us 132180
+ 6609 × 100 what gives us 660900
+ 6609 × 3000 which equals 19827000

= 20679561
