Let's calculate 7982 x 9890
7982 × 9890 = 9890 × (7982)
+ 9890 × 2 that results in 19780
+ 9890 × 80 what gives us 791200
+ 9890 × 900 which equals 8901000
+ 9890 × 7000 producing 69230000

= 78941980
