Alright, let's work through 2820 times 9966 step by step
2820 × 9966 = 9966 × (2820)
+ 9966 × 0 that equals 0
+ 9966 × 20 what gives us 199320
+ 9966 × 800 giving us 7972800
+ 9966 × 2000 producing 19932000

= 28104120
