We're going to solve 1991 multiplied by 1802
1991 × 1802 = 1802 × (1991)
+ 1802 × 1 which equals 1802
+ 1802 × 90 producing 162180
+ 1802 × 900 what gives us 1621800
+ 1802 × 1000 producing 1802000

= 3587782
