Alright, let's work through 9982 times 3980 step by step
9982 × 3980 = 3980 × (9982)
+ 3980 × 2 resulting in 7960
+ 3980 × 80 that results in 318400
+ 3980 × 900 producing 3582000
+ 3980 × 9000 what gives us 35820000

= 39728360
