Alright, let's work through 4220 times 990 step by step
4220 × 990 = 990 × (4220)
+ 990 × 0 that results in 0
+ 990 × 20 what gives us 19800
+ 990 × 200 producing 198000
+ 990 × 4000 giving us 3960000

= 4177800
