Let's calculate 3989 x 9851
3989 × 9851 = 9851 × (3989)
+ 9851 × 9 that results in 88659
+ 9851 × 80 what gives us 788080
+ 9851 × 900 that equals 8865900
+ 9851 × 3000 resulting in 29553000

= 39295639
