Alright, let's work through 6661 times 9980 step by step
6661 × 9980 = 9980 × (6661)
+ 9980 × 1 resulting in 9980
+ 9980 × 60 resulting in 598800
+ 9980 × 600 producing 5988000
+ 9980 × 6000 giving us 59880000

= 66476780
