We're going to solve 1990 multiplied by 6840
1990 × 6840 = 6840 × (1990)
+ 6840 × 0 what gives us 0
+ 6840 × 90 which equals 615600
+ 6840 × 900 producing 6156000
+ 6840 × 1000 giving us 6840000

= 13611600
