We're going to solve 1981 multiplied by 9140
1981 × 9140 = 9140 × (1981)
+ 9140 × 1 giving us 9140
+ 9140 × 80 that results in 731200
+ 9140 × 900 producing 8226000
+ 9140 × 1000 yielding 9140000

= 18106340
